Jennifer Lawrence isn't so keen on the idea of hooking up with Justin Bieber.

Bieber told Capital FM back in November that he found Lawrence "sexy," but the outspoken Oscar winner did not return the compliment when she spoke with Andy Cohen on Monday's "Watch What Happens Live." When asked if she'd ever consider getting together with the 21-year-old heartthrob, Lawrence answered, "I'm going to say hard no."

WATCH: 12 Times You Wanted to Be Jennifer Lawrence’s Best Friend in 2015

The 25-year-old actress was, however, more than willing to gush over her off-camera makeout session with her "Hunger Games" co-star Liam Hemsworth and locking lips with Bradley Cooper in four films.

"When you kiss Bradley Cooper in a movie, tongues happening?" Cohen asked. Lawrence admitted that she does french kiss her co-star -- who's appeared with her in "Joy," "American Hustle," "Serena" and "Silver Linings Playbook" -- but wasn't sure if that was acceptable behavior.

WATCH: Jennifer Lawrence Reveals She Made Out With Liam Hemsworth When Cameras Weren't Rolling

"That's normal, right?" she quipped. "Or am I, like, a perverted co-star?" She added that he was a "fantastic kisser."

Despite the onscreen friskiness, Cooper made it very clear when he was on Howard Stern's Sirius XM radio show that he would never hook up with Lawrence off set. "It just didn't happen," he said, clarifying that he and Lawrence would "never" sleep together. "It's not the way we are together."

WATCH: Jennifer Lawrence Admits to Seth Meyers That She Almost Asked Him Out