Jennifer Lopez wants to marry her boyfriend Casper Smart.

The 42-year-old singer is thought to be ready for a fourth trip down the aisle after announcing she was parting ways with Marc Anthony last July.

The rapper - who dated Jennifer for two-and-a-half years from 1998 - thinks his pregnant ex-girlfriend will be a natural when it comes to motherhood, and intends to lavish the tot with gifts when it enters the world.

He told People magazine: "She's always wanted to be a mother and now she's going to be."

The three-times married diva has defended her relationship with husband Marc Anthony, dismissing recent reports that it is on the verge of a break up.

While many women, and men, have questioned how one of the most beautiful women in the world can wake up next to a ghost-like Anthony, J.Lo has told Harper's Bazaar magazine that it has nothing to do with his looks.