The pretty pair have been spotted enjoying each other's company on the streets of Boston, at a park in Paris and in the waters of Hawaii (to name a few), but for the first time the couple made an appearance for a formal event! Cooper was joined by his leading lady for the American Hustle world premiere party presented in part by Grey Goose Vodka and Vanity Fair at Ziegfeld Theater in New York City on Sunday.
Cooper and Waterhouse coordinated their outfits, with the A-list actor wearing a gray suit and black tie, while Suki kept it simple and chic in a gray turtleneck.
Waterhouse recently spoke about her relationship with the actor for the first time since their romance went public.
The 21-year-old model graces the cover of Elle U.K.'s January issue and says that she doesn't talk about her boyfriend "because it's boring."
She added, "I'm not one of those girls who goes on about their boyfriends. I do think whatever I say will sound weird. But the truth is, if it start talking about him, I probably won't be able to stop. And I don't really want to talk about him, you know?"
Cooper, who plays FBI agent Richie DiMaso in American Hustle, became nearly unrecognizable while filming because of his new hair 'do for the movie—even with his own friends.
"I would go out and see some of my buddies at night and they would have no idea who I was actually, for the first two minutes. You get this weird feeling of, 'Oh, this is what it would be like if I didn't know you. They're kinda violent,'" Cooper tells E! News, and then continued to describe the hair transformation.
"Three hours every day. 110 curlers and then I'd sit under the thing [the dryer] and I would fall asleep so my head would hit the thing and so when they would take the rollers out, they'd be like, 'Is it gonna be finished?"
Watch the clip to hear more from E! News' interview with Bradley Cooper!
Tune in to E! News weeknights at 7 p.m. & 11:30 p.m.