Khloe Kardashian blames her sister Kourtney for her recent weight gain.

The 'Keeping Up with the Kardashians' star is embarking on an exercise programme to shed some excess pounds, and joked she is sporting a fuller figure in ''sympathy'' for her older sibling, who is pregnant with her third child.

Posting a selfie on Instagram, Khloe - who recently split from boyfriend French Montana - wrote:''Monday with @gunnarfitness!!! I am determined to get my pre-hamptons, pre- sympathy kourtney pregnancy weight off.

''Nothing good comes easy. Why do I blame Kourt though?!? Lol. (sic)''

And the 30-year-old star also bemoaned her friend Malika for not making her stick to a diet.

She tweeted: ''I had to do something in the gym today. I ate so poorly yesterday. I blame @theforevermalika lol (sic)''.

Khloe recently complained she had gained at least 10lbs while shooting 'Kourtney & Khloe Take The Hamptons' over the summer.

She tweeted earlier this month: ''Started working out again this week after slacking for a few months while taping in the Hamptons. I def gained about 10 lbs or even more. Oye! Focused now.(sic)''

It was recently claimed Khloe and French had split because he had grown too ''needy''.

A source said: ''They are on a break. The relationship got too heavy and Khloe needed to take a step back.''

Another insider added: ''It grated on her that he became so dependent on her.''