Rihanna flashes her PIERCED NIPPLE in see through dress, breaks Grammys dress code

When we heard the Grammys had instated a strict dress code, we knew that Rihanna would be the star most likely to break the rules.

Rihanna rocked a sheer red gown. Copyright: [getty]

And it wasn't just us, betting types William Hill also had Rihanna down as the celeb most likely to suffer a wardrobe malfunction or nip slip at this year's Grammys.

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However, turns out that they didn't factor in all Rihanna wardrobe possibilities...

Never one to disappoint Rihanna turned up at the awards at the Staple Centre in LA tonight rocking a sheer red gown with a huge flowing train which left very little to the imagination.

And while she didn't encounter a nip slip, she did give us a flash of a rather er, intimate piercing.

Rihanna's dress featured a huge flowy train. Copyright: [getty]

Y'see we could see Rihanna's NIPPLE RING through her dress! Does that count as a nip slip?! We hope William Hill has some answers!

Apparently, after what the star wore last year organisers were keen to keep things covered up this year.

According to Deadline Hollywood, guests all received a memo reminding them to cover up.

The note read: "Please be sure that buttocks and female breasts are adequately covered."

Yes, that is a pierced nipple you can see... Copyright: [getty]

"Bare sides or under curvature of the breasts is also problematic. Please avoid sheer see-through clothing that could possibly expose female breast nipples."

No sheer see through clothing? Clearly, Rihanna missed the memo.

Still, they do say rules are there to be broken and this is Rihanna we are talking about. Frankly, she can wear whatever the heck she wants.

Also on the carpet tonight was Rihanna's on/off boyfriend Chris Brown however, the pair chose to pose separately.

Inside the ceremony was another story and the couple looked very love up with Chris putting his arm round Rihanna as they watched the show.

Rihanna and Chris looked ery loved up at the ceremony. Copyright: [getty]

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It was, of course, after the Grammys back in 2009 that Chris was arrested for assault after punching Rihanna in the face.