Brad Pitt and George Clooney participated in a table reading of the play 8 last night -- a work that explores the legal battle to overturn Proposition 8, California's ban on gay marriage.

Clooney recently addressed rumors he is gay, in an interview with The Advocate, saying: "My private life is private, and I'm very happy in it. Who does it hurt if someone thinks I'm gay? I'll be long dead and there will still be people who say I was gay. I don't give a s--t. I think it's funny, but the last thing you'll ever see me do is jump up and down, saying, 'These are lies!' That would be unfair and unkind to my good friends in the gay community. I'm not going to let anyone make it seem like being gay is a bad thing."

Pitt has said he and partner Angelina Jolie wouldn't marry until ALL couples have the legal right to wed. Pitt and Clooney were joined by fellow actors martin Sheen, Jamie Lee Curtis, Kevin Bacon, Modern Family's Jesse Tyler Ferguson, Glee's Jane Lynch, Matthew Morrison, and Chris Colfer, and George Takei.

Click through to about the 30-minute mark to see a recording of the table reading at the Wilshire Ebell Theater last night ...