Add Sophia Bush to the growing list of grousing stars upset over the passage of California's gay-marriage annihilating Prop 8.

"I’m really proud to be an American," the One Tree Hill star said of the election of Barack Obama, "and I’m embarrassed to be a Californian right now.

Speaking to E! News at Thursday's DSquared party in the penthouse of Hollywood's Chateau Marmont, Bush said she was psyched to see Obama win, especially since she campaigned for him. She also hopes to attend his Jan. 20 inauguration.

But her excitement was tempered by the narrow passage of Prop 8. "It's just so sad that when we've been so progressive, we've also taken so many steps backward," she said, choking up. "I'm disgusted.

"In a world that is so full of hatred and bigotry and war and famine…We're criticizing two people for loving each other. I think that it's devastating."