Jennifer Lawrence regretted getting drunk for sex scene with Chris Pratt

Jennifer Lawrence plied herself with alcohol before engaging in her first ever sex scene with Passengers co-star Chris Pratt in a bid to settle her nerves.

The Hunger Games star, 25, admits she was so inexperienced in preparing for the steamy scene, she decided to have a few drinks before the shoot - but the booze only made it worse.

"I had my first real sex scene a couple weeks ago (while shooting Passengers with Chris Pratt), and it was really bizarre," she says during a recent actresses round table discussion staged by The Hollywood Reporter. "It was really weird."

"I got really, really drunk. But then that led to more anxiety when I got home because I was like, 'What have I done? I don't know.'"

Jennifer confesses she felt all the more awkward about getting intimate with the Guardians of the Galaxy hunk because he is married to fellow actress Anna Faris.

"He was married," she continues. "And it was going to be my first time kissing a married man, and guilt is the worst feeling in your stomach. And I knew it was my job, but I couldn't tell my stomach that. So I called my mom, and I was like, 'Will you just tell me it's OK?'

"It was just very vulnerable. And you don't know what's too much. You want to do it real, you want everything to be real, but then... That was the most vulnerable I've ever been."

Jennifer had reason to feel uncomfortable pretending to be Chris' lover after recent gossip suggested the actor was attracted to the Oscar winner.

His wife, Anna, dismissed the unfounded claims in August (15), but admitted the speculation struck a nerve with her because she never expected her "incredible relationship" to become tabloid fodder.

The House Bunny actress revealed the cheating speculation was "devastating", even though she knew it wasn't true.

"For us it was like, 'What the heck?'," she told FOX411. "This has been blindsiding to us. It has been weirdly stinging. (That affair gossip) stung a little bit harder than I thought it would. I have always kind of believed that part of the rumors of celebrity couples were sort of true - because they had never been a part of my life. I thought, 'Maybe there is a kernel of truth to that'."

The sci-fi film, directed by The Imitation Game filmmaker Morten Tyldum, follows colony ship passengers on a decades-long interstellar journey. It is due for release next year (16).

The movie was given the greenlight in the spring (15) after multiple delays. Other stars previously linked to the project have included Keanu Reeves, Reese Witherspoon and Rachel McAdams, who reportedly exited the production in 2014.