Celebrities at Comic-Con

Actor Robert Downey Jr., right, and actress Rachel McAdams, left, pose while promoting their new film "Sherlock Holmes" at the Comic-Con International 2009 convention held in San Diego, Friday, July 24, 2009. The annual comic book and popular arts convention attracts over 100,000 people and runs through Sunday.

Rachel McAdams, left, and Cameron Diaz pose for photographers while promoting their new films at the Comic Con International 2009 convention held in San Diego, Friday, July 24, 2009. McAdams stars in the upcoming film "Sherlock Holmes," while Diaz was at the convention to discuss her new movie "The Box."

Actress Cameron Diaz and actor James Marsden pose while promoting their new movie "The Box" at the Comic-Con International 2009 convention held in San Diego, Friday, July 24, 2009.

Actor Don Cheadle, left, and actress Scarlett Johansson, right, wave to fans at the end of a panel for their new movie "Ironman 2" at Comic-Con International 2009 convention held in San Diego, Saturday, July 25, 2009. The annual comic book and popular arts convention attracts over 100,000 people and runs through July 26.

Actress Scarlett Johansson poses for photographers after a panel for her new movie "Ironman 2" at Comic-Con International 2009 convention held in San Diego, Saturday, July 25, 2009.

Actress Megan Fox poses next to a poster for her new film "Jonah Hex" at the Comic-Con International 2009 convention held in San Diego Friday, July 24, 2009. The annual comic book and popular arts convention attracts over 100,000 people and runs through Sunday July 26. (AP Photo/Denis Poroy)

Actor Josh Brolin, right, poses with an unidentified reporter dressed as Supergirl while promoting his new film "Jonah Hex" at the Comic-Con International 2009 convention held in San Diego, Friday, July 24, 2009.

Actress Mila Kunis poses next to a poster for her new movie "The Book of Eli" at the Comic-Con International 2009 convention held in San Diego, Friday, July 24, 2009.

Actor Denzel Washington talks about his new film "The Book of Eli" at the Comic-Con International 2009 convention held in San Diego, Friday, July 24, 2009. The annual comic book and popular arts convention attracts over 100,000 people and runs through Sunday.

Kristen Stewart, left, and Robert Pattinson, right, pose for a photo during news conference held to promote their film "New Moon" at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009. The annual comic book and popular arts convention attracts more than 100,000 people and runs through Sunday, July 26.

Taylor Lautner, left, Kristen Stewart, center, and Robert Pattinson, right, pose at a news conference held to promote "New Moon," the second film in the "Twilight" series, at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009.

Actor Robert Pattinson smiles as he listens to a question at a news conference held to promote his new film "New Moon" at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009.

Director Tim Burton talks about his new movie "Alice in Wonderland" at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009. The annual comic book and popular arts convention attracts more than 100,000 people and runs through Sunday, July 26.

Actor Johnny Depp waves to fans as he makes an appearance at a panel held for his new movie "Alice in Wonderland" at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009. Depp plays the Mad Hatter in the film.

Actor Adam Samberg talks about his movie "Cloudy With a Chance of Meatballs" during a press event in San Diego, Thursday, July 23, 2009.

Actress Audrina Patridge talks about her new film "Sorority Row" at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009.

From left, actress Olivia Wilde and actors Garrett Hedlund and Jeff Bridges speak about their upcoming movie "Tron: Legacy" at Comic-Con in San Diego, Thursday, July 23, 2009.

Actor Freddie Highmore, right, and actress Kristen Bell, left, talk about their upcoming movie "Astro Boy" at Comic-Con in San Diego, Thursday, July 23, 2009.

Actress Ashley Greene poses for photos to promote her movie "New Moon," the second in the "Twilight" film series, at the Comic-Con International 2009 convention held in San Diego, Thursday, July 23, 2009. Greene stars in the film alongside "Twilight" veterans Robert Pattinson, Kristen Stewart and Taylor Lautner.

Anna Faris talks during a media event at Comic-Con in San Diego, Thursday, July 23, 2009. The annual comic book and popular arts convention attracts more than 100,000 people and runs through Sunday, July 26.