A Proposal in Mary-Kate's Future

Mary-Kate Olsen and David Katzenberg are so firmly back together that sources say romantic David is waiting for just the right moment to pop the big question! Their first affair lasted for about nine months, but MK broke it off in September 2004. However, two months after MK's painful breakup with Stavros Niarchos III, 20, in September 2005 (he's now with Paris Hilton, 25), they reunited. "David is crazy in love with Mary-Kate [19]," a source tells Star People. "And he says that he is not going to let her slip through his fingers again. He says that she is the love of his life. She's the woman he wants to spend the rest of his life with.

"He's totally gone! He said he knows he wants to marry Mary-Kate and have children with her, and he's just trying to build up to the right moment to ask her."

But David, the 22-year-old son of DreamWorks studio boss Jeffrey Katzenberg, may be in for a letdown. "Mary-Kate's happy to be back with him again and is enjoying his company," the source says. "But I don't think she's ready for marriage or anything just yet.

"She just wants to take things slowly and have fun hanging out. I think she feels way too young for a marriage commitment at the moment."

Source: Star