Explaining what he was doing at a movie event the same night as the Grammys, the Rolling Stone said he was part of a rock star-movie star exchange program.
"Sir Anthony Hopkins is in the recording studio with Amy Winehouse," joked Jagger, "and we are hoping that next week Sir Brad and all the Pitt family will be performing The Sound of Music at the Brit awards."
Sitting in the audience with fellow nominee (for Changeling) Angelina Jolie, Pitt cracked up and applauded along with the rest of the crowd inside London's Royal Opera House.
While Danny Boyle's Slumdog picked up seven BAFTAs – best film, director, screenplay, score, sound, editing and cinematography – Pitt's The Curious Case of Benjamin Button racked up three: for production design, makeup and hair and special visual effects.
Winslet Verged on TearsThe Reader best actress Kate Winslet attended the ceremony with her parents. "I'd like to thank my Mum and Dad, who I won't look at right now or I will burst into tears," Winslet said at the podium.
Dave Hogan / Getty
The Wrestler best actor, Mickey Rourke, mirroring his Golden Globe victory, thanked director Darren Aronofsky for the second chance he was given "after f---ing up my career for 15 years." Rourke, dedicating his award to his pal, the late actor Richard Harris, also thanked costar Marisa Tomei.
"She's such a hell of a talent," said Rourke, "and it was very brave of her to take her clothes off all the time, and I enjoyed looking at her."
Heath Wins Another OneHeath Ledger repeated his Golden Globe and SAG Award wins as best supporting actor, for The Dark Knight, and Penelope Cruz was honored for her supporting role in Woody Allen's Vicky Cristina Barcelona.
"I am always surprised when I win something," said Cruz, "because I've been working since I was 16. so I am much more used to losing than to winning."
At the New York BAFTA viewing party, the crowd's biggest hand of the evening went to the on-screen tribute to Paul Newman, who died in September.
Reporting by SIMON PERRY
See the Jolie-Pitts' family photos
Revisit Heath Ledger's life in pictures