Jennifer Lawrence says Justin Timberlake was her childhood crush.

The 'Hunger Games: Catching Fire' actress used to spend hours gazing at pictures of the handsome 'N Sync singer when she was a teenager and sometimes she'd feel sick because she liked him so much.

Speaking in a Yahoo! fan Q&A, Jennifer said: ''My teen crush [was] Justin Timberlake. Early 90s Justin Timberlake. I remember buying the 'N Sync CD. Remember how CDs had the pull-out picture things? I got so overwhelmed with hormones I almost threw up.''

The 23-year-old star also shared her funniest memory from filming the highly-anticipated 'Hunger Games' sequel, in which she reprises her role as fearless heroine Katniss Everdeen.

Jennifer believed she had a supernatural experience on set when she felt ancient spirits slap her butt, but realised after watching the playback that it was actually newcomer Sam Clafin's trident poking her in the rear.

She recalled: ''We were in the middle of doing this scenes with the monkeys, There were all these choreographed fight. Something just whipped my butt. Something slapped my butt.

''We're watching playback. Josh [Hutcherson] is telling me it's ancient spirits and I'm believing it. Then we slowed down.

''The end of Sam's trident and flew off and whacked me in the butt. There was a red mark on my butt. That was funny.''