[Christina Aguilera, Mathew Rutler via] Sienna Miller gets honored for her humanitarian work; Christina Aguilera, David Arquette and some others step out for a very Bolthouse video game launch blowout; Malcolm McDowell, Bob Weinstein and more have a post-premiere celebration at The Little Door; Babs Streisand is honored at the Cedars-Sinai Board of Governors gala—there was quite a range of events last night, let's discuss in this edition of Last Night's Parties. More»

• Singer Alexis Houston, who maybe got it on with Matt Lauer, but then had a press conference to say that she never got it on with Matt Lauer, used to be a he. She's also not really Whitney Houston's cousin. [Post]
• Manhattan singleton sues Amy Laurent International matchmaker because he's still a singleton. [NYDN]
• Celebrity Rehab is trying to lure Laguna Beach star Jason Wahler. Good. No one treats Lauren Conrad that way unless he's way out of it. [TMZ]
• Broadway Union Fight! As in American Guild of Musical Artists vs. Actors' Equity Association. [WSJ]
• Building biology consultant will help you clean your apartment, survive chemical apocalypse. [NYT]

• Jude Law does a dramatic reading of Lady Gaga's "Pokerface," and another woman is pregnant with his baby. Kidding about that second part, but you never know. [NBC]

• Madonna prefers death over marriage. Well that's certainly one school of thought. [People]

• Former Hills star and Lauren Conrad flame Jason Wahler in jail. And here we thought he was such a winner. [EOnline]

• Nude photo of Brooke Shields at ten years old causes uproar at London's Tate Museum. Roman Polanski wonders what all the fuss is about. [ONTD]

• Conan O'Brien banned from Newark. He must be devastated. [NYP]

• Being a bad guy is good for your career. And fun! [CNN]