Kim Kardashian’s incredible “Colorful Bikini” body on Miami beach

She's always been one to jump on the latest diet bandwagon, whether its working up a sweat at bootcamp or promoting a slimming shake.

But Kim Kardashian's latest get in shape plan is an invention all of her own - the 'sex diet'.

As the reality star showed off her beach ready curves in Miami it emerged that she had honed them with the help of boyfriend Kanye West.

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Beach ready: Kim accessorised her bright orange bikini with a matching mani-pedi

Been on the sex diet? Kim Kardashian wears a colorful bikini on Miami beach as it emerged that she had honed them with the help of boyfriend Kanye West

Beach ready: Kim accessorised her bright orange bikini with a matching mani-pedi

A close friend told the National Enquirer: 'We jokingly refer to it as the sex diet. When one of us is having regular sex, that tends to burn calories and kill the appetite.

'Losing seven pounds in seven days means being a very naughty girl.'

Kim showed the results of her special workout as she stepped onto the beach in Malibu last week.

With her publicicst friend Jonathan Cheban at her side, she walked in a black sarong, tied over a black and bright orange strappy bikini.

In great shape: Kim 's weight has fluctuated over the years but she is naturally curvy

Kim then shed the sarong for a dip in the azure waves, with The Spin Crowd star Cheban holding her belongings as he waited on shore. After her dip she showed him a few workout moves, doing some stretches on the beach.

Kim's weight has fluctuated over the years, with the petite 31-year-old oscillating between a gym honed taught figure and her more natural curvy shape.

Recent pictures of her in form fitting outfits have sparked speculation that she has added weight to her curves.

Limbering up: After her dip Kim showed off a few workout moves, doing some stretches on the beach

Taking some tips: Kim was joined by her publicist friend, The Spin Doctor star Jonathan Cheban

And according to the source that is just what she is aiming for.

'Kanye loves her curves and has told her repeatedly that she shouldn't get too skinny,' they said. 'He's always encouraging her just to be happy and healthy and do things for herself and not give in to peer pressure, which is why he doesn't think she should lose weight.

'Kim was speechless, especially when he told her he missed her love handles. Kanye can't understand why she has lost weight when she knows it's not the look he likes.

'He thinks Kim should be doing everything to please him - not herself.'

What you up to Kim? Cheban looks a little surprised as his friend starts pouting and sucking in her stomach

Is that a camera? Kim sheds her sarong ready for her close up

But while Kim may be enjoying the 'sex diet', her weekend entertainment was decidedly more PG.

It saw Kim helping out her older sister Kourtney as she took care of nephew Mason for the day.

After enjoying a 'sleepover' together the two-year-old accompanied Kim to church, before the two went to the park.

'Fun day at church with Mason today, then a BBQ & swimming with friends & family. Couldn't have been a more perfect Sunday!' she tweeted.

That was fun: Cheban is one of the reality star's closest friends, despite their occasional rows

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