According to Page Six, Leonardo DiCaprio and Gisele Bundchen, who have dated for years and were reportedly engaged, have called it quits for good. The Six sleuths haven't found out why the couple split, but "expect to hear about a third party."Christian Slater is earning back his bad-boy rep. In the spring, he was picked up for groping. Over the weekend, he fell off Paris Hilton's roof during a party. Apparently the 36-year-old star, who tried to put the moves on Lindsay Lohan earlier this year, climbed to the roof to inspect some neighbors who made a noise complaint. He then fell and landed in the bushes. "[He was] not injured, not hurt, not arrested," said an LAPD spokesperson. She denied reports that officers used a Taser gun on the actor. Christian used to be so cool -- he's turned into such a loser. Ethan Hawke, who famously cheated on ex-wife Uma Thurman while making a movie, is reportedly trying to get his paws on Sienna Miller, whose ex Jude Law famously cheated on her -- with his kids' nanny -- while making a movie. Advice to Sienna: no sequels. Mary-Kate is close to signing a deal to play a skinny speed freak in Factory Girl, which stars -- drum roll, please -- Sienna Miller. She already has the skinny part down -- no comment on the speed thing.So, Donald Trump thinks Martha Stewart sucks? Well, she thinks he sucks too. In fact, when she was tapped for her own Apprentice show, she was told that she was going to be replacing the Donald. "It was discussed that I would be firing the Donald on the first show," Martha said. "I don't think he ever knew." Does now. Kim Basinger and Alec Baldwin continue to go off on each other. Yesterday they had a court date. Kim was there; Alex skipped the proceedings. One of the nasties? "It is sad and pathetic how Ms. Basinger is contaminating this child," said Alec's lawyer. "She is turning Ireland against her father, creating a protective shield around her. It's clear that Ms. Basinger has lodged a war." Hope their kid doesn't read the newspaper, go online or watch TV.A funny: "I'm pleased that I look very good for my age," said Joan Rivers to Entertainment Tonight on her numerous plastic surgeries. I'd like to get my hands on whatever mirror she owns. I think I'd suddenly turn into Miss America.Woody Allen says his relationship with former daughter/current wife Soon-Yi Previn, which has a "more paternal feeling," is "one of the truly creepy, disgusting, hideous lucky things that happened to me in my life." I'm sure Mia is throwing something across the room at this very moment.Entourage star Debi Mazar is expecting her second child. She's due in February.