Actress Kristen Stewart is happy about the casting of her "Twilight" co-star and former boyfriend Robert Pattinson as Batman, saying he is the "only guy that could play that part".

Pattinson has replaced actor Ben Affleck to be the caped crusader. He will be seen as the superhero in filmmaker Matt Reeves' upcoming film.

"I feel like he's the only guy that could play that part," variety.com quoted Stewart as saying.

"I'm so happy for him. It's crazy. I'm very, very happy about that. I heard that and I was like, ‘Oh man!' It's awesome," she added.

Stewart and Pattinson broke out in the Hollywood scene with "Twilight" series. Pattinson essayed the role of swoon-worthy vampire Edward Cullen and Stewart was his Bella Swan.

The actress also agreed that Pattinson has the "perfect cheekbones" to play the crime-fighting billionaire Bruce Wayne.

Stewart opened up about Pattinson's casting as she sat down to talk about her upcoming movie "Seberg" at the Toronto International Film Festival.