The 37-year-old actress, who played Batgirl alongside George Clooney and Chris O'Donnell in the 1997 flick Batman & Robin, says she thinks Affleck will do a fantastic job playing the caped hero in the upcoming Man of Steel sequel.
"That sounds so cool," Silverstone told us at last night's L.A. premiere of Ass Backwards. "I did hear about that. That sounds cool."
"I think it's great," she added. "I like him."
It was announced back in August that Affleck would portray Batman alongside Superman Henry Cavill in Zack Snyder's Man of Steel sequel. Silverstone joins the list of celebs who've defended the Affleck casting choice amid lots of fan backlash.
Hugh Jackman spoke out in favor of the Oscar winner playing Batman, saying, "He's a Boston kid, right? He's a tough guy...I know [Ben] a little bit and I know he's going to relish the opportunity to go and crush it. I have no doubt he's going to crush it."
Affleck's wife Jennifer Garner also publicly commented, saying, "I was excited for him. I was excited because he had a real take on what he wanted to do, and you know, I have to say, my husband is a pretty great storyteller himself, and I'm excited to watch him do it."
The Man of Steel sequel is due in theaters July 17, 2015.