Bradley Cooper and Suki Waterhouse made their first public appearance as a couple at the New York City premiere of his movie, "American Hustle" on Sunday. The pair have already been dating for months.

According to the Los Angeles Times, the 38-year-old actor and 21-year-old British Burberry model looked very cozy while having dessert.

Cooper didn't take a photograph with his younger girlfriend on the red carpet. But Waterhouse did join her love, and his costars, at a table for food.

"Guests were greeted with cocktails before entering the massive space, which was decked out '70s style, complete with sparkling disco balls," said a source to US Weekly about the event hosted by Grey Goose vodka and Vanity Fair. "Cooper posed with fans for photos, and later caught up over dinner [with Waterhouse]."

The two first laid eyes on each other at the Elle Style Awards in February. Reportedly, the pair have been dating for nine months, alerting the media to their romance in March. At that time, Cooper was in Boston filming the David O. Russell film with Christian Bale, Amy Adams and his "Silver Linings Playbook" costar, Jennifer Lawrence.

The couple had kept their relationship under wraps, but had been caught in public displays of affection over recent months. 

But Waterhouse is mum the word when it comes to Cooper.

"I don't talk about my boyfriend because it's boring," said Waterhouse in Elle UK's January issue. "At least, that's what I decided to tell you when you asked. Look, maybe it's best for me to say, '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 I 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,"  had dated Zoe Saldana, who married Italian artist, Marco Perego in July. 

Do you think Waterhouse and her actor beau will make more appearances together? Tell us your thoughts in the comments section below!