Sean 'Diddy' Combs

Diddy has vowed to marry his pregnant girlfriend - but not yet. The rapper's long-term partner Kim Porter, who he has been dating on and off for almost a decade, is expecting twin girls in December. They already have a nine-year-old son, Christian, together. However, Diddy, real name Sean Combs, insists he is not ready to make an honest woman of Kim yet.He told Vibe magazine: "I'll get married when I'm ready. I have to be ready to tie the knot. But if I marry anyone, Kim will be the woman."Diddy, 36, has also revealed he never wanted to marry ex-girlfriend Jennifer Lopez. The hip-hop star insists he never felt the urge to tie the knot with J.Lo like all her other lovers have. He said: "I couldn't commit to Jennifer the way she wanted me to. Everybody who ever meets the girl winds up marrying or wanting to marry her. I couldn't be like Cris Judd, Ben Affleck and Marc Anthony."Last week, Diddy claimed he never loved Lopez, who is now married to Latin star Marc Anthony, and that throughout their relationship he was still in love with Kim.The music mogul has now revealed Kim told him he would come back to her once he got bored with J.Lo. He explained: "Kim never really sweated Jennifer She was like, 'Ah, you're playing yourself. You're running around with your little Puerto Rican girlfriend. You'll be back.' And she was right."