Kim Kardashian in a bikini photo posted on Instagram as she prepares to show off post-baby weight loss

Kourtney Kardashian has posted an old photo of Kim Kardashian in a bikini on Instagram amid rumours that Kim's DYING to show off her post-baby weight loss.

Kourtney Kardashian shared this old photo of her and Kim Kardashian in their bikinis as Kim gears up to showing …Kourtney posted the vintage snap of her and Kim on the beach in brightly-coloured bikinis during a holiday to Mexico in 2011.

The photo comes just days after reports emerged that Kim, who gave birth to North West on 15th July, is worried she's left it too long to debut her post-baby weight loss.

Kim Kardashian hasn't been out publicly since her pregnancy. Copyright [Splash]The Keeping up with the Kardashians star has been in hiding at her mum's house since she had her daughter, as she shifts the weight she put on during her pregnancy.

A source told RadarOnline: "Kim has had this plan to show off how great she looks after giving birth and selling the pictures or videos for a lot of money, but she's getting worried that it's been too long and people aren't as excited about seeing her anymore."

Kim Kardashian has posted a funny Keek video of herself - but has kept her post baby body covered. Copyright [ …The source continued: "Kim is used to having millions of adoring fans begging to see her all the time, but there has been a shift in her fan base and she is getting nervous that people don't care as much about her."

[The truth about Kim Kardashian's post-baby body]

[Kourtney and Kim Kardashian 'at war' over motherhood?]

Kim is reportedly spending £40,000 on a chef, £12,000 on a personal trainer and an extra few thousand quid on stylists and make-up artists to ensure she's looking her absolute best when she does return to the spotlight.

A source explained: "Kim has been working really hard to lose the baby weight. She's already lost over a stone, which is incredible, but she's not satisfied. Kim doesn't want anyone to see her body until she looks perfect."

Kim Kardashian dons her trusty black maxi dress and white blazer combo the day after her baby shower. Copyright [Splash]
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Yahoo Celebrity UK
Tue, Jun 4, 2013 12:00 BST