Diddy believes Jennifer Lopez's bum is a ''work of art''.

The 44-year-old record producer - who dated J-Lo, 44, for two years in 1999 - gushed over the 'Get Right' singer and insists he is ''lucky'' to count her amongst his exes.

He told Access Hollywood Live: ''Oh my God. I'm so lucky to have that great woman in my history, she is one of the greatest I've ever seen.

''I mean, it's great. It's a work of art. It's something that will go down in history, for real it will. But also her talent, her drive, her determination, she will never give up. She's a great friend of mine, always will be my friend, and I mean that thing is just incredible, man.''

The 'I Need A Girl' rapper also slammed Kim Kardashian's famous backside and added that it is ''no way'' comparable to Jennifer's curvaceous posterior, although he hopes his decision won't upset Kim's husband, fellow rapper Kanye West.

When asked by host Billy Bush if the reality TV star's bottom rivals that of the 'Booty' hitmaker, Diddy said: ''No way! ''No way. No disrespect to Kanye and Kim but that thing right there, that thing right there is something special.''