Katy Perry made her debut as a Saturday Night Live host last night, and it was a show filled with just as many actual celebrities as celebrity impressions. Perry was heavily featured—and there weren't nearly as many boob jokes as initially predicted—but Alec Baldwin, Matt Damon, Val Kilmer, and Darrell Hammond also…

• Reese Witherspoon announced today that she's engaged to Hollywood agent Jim Toth, but all is not well in Tinseltown; Rihanna and Matt Kemp have split because she's "over it."

• When Kristen Stewart's controversial rape analogy, which she apologized for, came up in an interview, Robert Pattinson launched into a rant, saying, "That whole system of Internet journalists, where no one is called to account, is almost entirely about hate..."

• In her interview with Rolling Stone, Lady Gaga says: "When I wake up in the morning, I feel just like any other insecure 24-year-old girl. Then I say, 'Bitch, you're Lady Gaga, you get up and walk the walk today.'"

• Prince William MIGHT ask Kate Middleton to marry him tomorrow, since June 3 and June 4 are "mysteriously blocked out" in the Buckingham Palace calendar.

• A source claims that Girls Gone Wild founder Joe Francis "physically attacked" two female employees, one of whom was "visibly pregnant," after he discovered that one of the employees was using her phone to talk to a media outlet:

• Casey Johnson the Johnson & Johnson heiress and recent fiancee of Tila Tequila, was found dead in her Los Angeles home by her maid yesterday morning. Johnson had reportedly been dead for several days. [TMZ]

• Seriously, Jennifer Aniston, what the hell are you doing? First you signed on for desperado babyfever flick The Baster, now you're doing a movie called Pumas. That's right: PUMAS. The plot:

• Etta James says when she was ripping Beyoncé about singing "At Last" for the President, "I didn't really mean anything…"

• Guy Richie will not fight ex-wife Madonna's plans to move their children to the United States, claiming that he would rather keep his children together than tear them apart with a nasty custody battle. [Mirror]