Kim Kardashian claims her brother's butt is biggest

London (ANI): Socialite Kim Kardashian has passed on the title of biggest butt to her brother.

Kim, 29, whose backside is the most talked about since Jennifer Lopez, said that her brother Rob should be given the honour, reports the Sun.

And to prove her point she posted a picture of his derriere on Twitter after she asked followers to guess the 'biggest butt in the family'.

Meanwhile, the reality TV star is reportedly set to move in with NFL star boyfriend Reggie Bush.