Just last month it was revealed that the pair were engaged after nearly two years together.
And today, Mary-Kate Olsen has revealed her MASSIVE vintage Cartier engagement ring for the first time since boyfriend Olivier Sarkozy popped the question.
The 27-year-old designer was sporting the rock, which was bought at a Sotheby's auction, at Paris Fashion Week as she stepped out with sister Ashley.
The European-cut four-carat diamond cost $81,250 (£53,100) at auction and is set in a floral-inspired design (SO on-trend) framed by saphires and single-cut diamonds.
According to StyleCaster, the ring dates back to 1953 and apparently belonged to a Tennessee-based collector before it was bought at the auction.
And although the couple are now happily engaged, it took Olivier, 44, two tries to get Mary-Kate to say yes.
A source told Us: "He tried about a year ago, and she wasn't ready. She didn't need to be wined and dined. She wanted to make sure he would be good to her."
But having finally said yes
Blog Posts by Nikki
The fashion designer would only have been pleased with a Cartier ring bought from Sotheby's, naturallyBy Nikki | omg – Fri, Mar 7, 2014 12:48 GMT
Just last month it was revealed that the pair were engaged after nearly two years together.Read More »from Mary-Kate Olsen's vintage engagement ring cost Olivier Sarkozy over £53,000
It's the moment we've all been waiting for...but we can't help but feel they've been overly-forgiving with their censorshipBy Nikki | omg – Fri, Mar 7, 2014 10:54 GMT
It's the moment we've all been waiting for - footage of a man urinating in jail HAS BEEN RELEASED.
After begging the Miami police not to reveal the shots of his manhood, Justin Bieber can breathe a sigh of relief, and then some.Read More »from Justin Bieber's urine sample video is finally released, check out the MASSIVE box
Not only does the clip NOT show off Justin's 'best bits', the people at Miami police have massively inflated the boy's ego by covering said parts with the biggest black box ever.
The 20-year-old is said to have begged the department not to release the footage uncensored following his arrest last month.
Biebs was hoping that the District Attorney would rule against the release of the intimate video, despite the further five tapes of his incaceration to be released in full.
The county judges said in court: "Mr. Bieber’s right to privacy is paramount. He has not lost his right to privacy, and that is what is important here."
Justin has already suffered the embarrassment of having the footage of his sobriety test released - showing him trying (and failing) to walk in a
The Avengers Assemble actress tries her best to cover up her teeny-tiny growing bumpBy Nikki | the juice – Tue, Mar 4, 2014 10:41 GMT
She's only just announced that she's engaged.Read More »from Scarlett Johansson conceals tiny baby bump after pregnancy news
But Scarlett Johansson has apparently been hiding an even bigger secret - she's pregnant with her first baby.
The 29-year-old actress, who is engaged to journalist Romain Dauriac, is reportedly due this July if TMZ are to be believed (they usually are).
The news comes after Scarlett skipped Hollywood's biggest night, the Oscars, setting tongues wagging.
She did walk the red carpet at the Cesar Film Awards in Paris late last month, but opted for a loose-fitting jacket which appared to show a hint of her growing baby bump.
Scarlett has made no secret of her desire to be a mum, recently saying: "I would like to have my own family, that would be nice.
"They say it's never the right time and I am sure that's true, but I think you have to plan it like anything else.
"At some point it is something I look forward to. I am fortunate in that I have had a long career - 20 years - that has been very diverse.
"So, you know, picking a time to plan a family
The Keeping Up With The Kardashians star should come with a health and safety warningBy Nikki | the juice – Mon, Mar 3, 2014 04:20 GMT
Well she was hardly going to go by unnoticed, was she?Read More »from Oscars 2014: Kim Kardashian's cleavage steals the show at Elton John's party
After clearly not making the cut for the ACTUAL Oscars, Kim Kardashian made sure she dominated the red carpet at Elton John's party.
Arriving in a dress that should have come with a health and safety warning, Kim showed off her best assets in a shocking red gown.
With the lowest neckline we've seen since Scott on Geordie Shores, the 33-year-old's Celia Kritharioti dress left little to the imagination.
Kim completed the look with red lippy and Lorraine Schwartz diamonds as she struck several thousand poses - including the necessary 'ring shot' - on the red carpet with her sisters, Khloe and Kourtney.
The Kardashians were joined by their mother, Kris, who could be seen encouraging photographers to take more snaps of Kim inside the bash.
Kim looked smaller than ever, showing off her tiny waist as her carb-free dieting continues ahead of her summer wedding.
The yummy-mummy is said to be desperate to be a size 0 bride, refusing to stop until
These two want to leave it out, before someone gets upset and suffers a broken heart, yeah?By Nikki | the juice – Mon, Mar 3, 2014 02:57 GMT
As if we aren't sick enough of seeing these two ALL OVER EACH OTHER at every awards event ever.Read More »from Oscars 2014: Bradley Cooper and Suki Waterhouse's kissing and PDA overload
Bradley Cooper and Suki Waterhouse have been shoving their romance in our faces again at the Oscars 2014.
After slipping in the back door to avoid red carpet attention together, the pair may as well have paraded around naked as they licked each other's faces on the front row.
Before the cameras started rolling - but not before the paps got inside, evidentally - Bradders and Suki pretty much ignored everyone around them as they stared lovingly into each other's eyes.
The pair, who met in March last year and have since been attached at the hip, are set to tie the knot next January after Bradley admitted that she's 'the one' (SOBS).
Suki is BFFs with Cara Delevigne, who has apparently been chatting with the model about wedding plans for the pair.
[ Bradley Cooper sits FROW as Suki walks the runway ]
A source exclusively told Yahoo Celebrity: "Cara has been encouraging Suki to tie the knot at the
After swapping her blonde locks for brown, the Wolf of Wall Street actress went by unnoticedBy Nikki | the juice – Mon, Mar 3, 2014 02:02 GMT
She's known for being the blonde bombshell who seduced Leonardo DiCaprio in The Wolf of Wall Street.Read More »from Oscars 2014: Margot Robbie's new brunette hair sees her ignored by paps
But Margot Robbie was so unrecognisable as she hit the Oscars 2014 red carpet that she almost wasn't papped.
After ditching her blonde locks for brunette, the 23-year-old had to be introduced to photographers after they looked dumbfounded when she arrived.
Completing her vampish look with lashings of deep purple lippy and a sparkling black gown, Margot definitely pulled the new look off.
The actress recently revealed that although she stripped for her Wolf of Wall Street scenes, she won't be making a habit out of it - even if Hugh Hefner came knocking.
The formerly-blonde stunner unsurprisingly caught a few eyes with her seductive role in Martin Scorsese's latest blockbuster and it wasn't long until Playboy got in touch.
After reportedly misleading her parents about her nude scene, it was unlikely she would be convinced to pose naked again, but that didn't stop Hugh trying.
The magazine boss
Sherlock star skips the Academy Award dress code and struts his stuff in a black tieBy Nikki | the juice – Mon, Mar 3, 2014 00:55 GMT
No one puts Benedict Cumberbatch in a bow tie unless he wants to be in a bow tie, yeah?Read More »from Oscars 2014: Benedict Cumberbatch ignores bow tie memo for once, swoonfest
Not even the threat of the wrath of the Oscars 2014 organisers was enough to force Benedict into wearing a dickie bow, despite it being mandatory at the event.
Looking as outrageously-fit as always in a black suit and white shirt, he instead opted for a plain black tie to top the look off (along with the love letter to us in his breast pocket, obvs).
Benedict received the most screams on the red carpet for the evening, struggling to make himself heard during his interview with Ryan Seacrest.
Trying desperately to talk above the screams, he explained to Ryan the difference between British and American fans.
He said: "I've got to be very careful about this as I've got a very large following at home, but they're very nice, listen to that!
"That's what the American fans are like, they want me to go over there and have a party, which I'd love to do. They're very vocal and they're up for a good time. I try to
MOTHER OF GOD, is this the best thing to ever happen on a weekday?By Nikki | the juice – Fri, Feb 28, 2014 14:59 GMT
As if we needed any more GoDling content to distract us from food/boyfriends/berocca/LIFE IN GENERAL, someone has cruelly created the most addictive website of all time.Read More »from Someone's set up a Ryan Gosling flirting website, we're done here
'Get Picked Up By The Gos' offers the chance to flirt with Ryan Gosling just by clicking a button. Yeah, you read that right.
Armed with a loaded back catalogue of Hey Girl memes, the site is slowly, but surely, taking out the women (and some men) at Y HQ.
Every time you click 'I Want More', they'll GIVE YOU MORE.
The supermodel admits to Jonathan Ross that she was offered a lot of money to do some weird thingsBy Nikki | the juice – Fri, Feb 28, 2014 10:48 GMT
She's made millions throughout her career as a supermodel.Read More »from Claudia Schiffer reveals an Arab prince offered her £1M for a date
But Claudia Schiffer didn't go as far as she could have done to cash in on her fame in the 90s.
The 43-year-old supermodel has revealed that she once refused a £1million offer by an Arab prince to spend an evening with him.
Appearing on the Jonathan Ross show, airing tomorrow night, she said: "The strangest one was an Arab prince.
"He asked if he could hire me for a dinner for a million pounds. I declined, and some other supermodel took it."
Claudia revealed she didn't want to get involved in the indecent proposal, instead insisting she made her fortune through hard work alone.
She added: "It’s not all about money. I just want to be able to walk down the street and be proud of what I do."
And while she might now finally be comfortable with her career, Claudia reckons she wasn't always as confident as she came across.
She added: "I am just shy when there are lots of people. I’m OK when we’re just one on one, or maybe four people, or
Watch all the action LIVE from the red carpet in HollywoodBy Nikki | the juice – Thu, Feb 27, 2014 13:38 GMT