Credit: Rabbani and Solimene Photography/WireImage; Rob Kim/FilmMagic

She's been hitting red carpets and after parties around the world lately to promote The Hunger Games, but Jennifer Lawrence would prefer to stay in -- hanging and pigging out with her bestie, Zoe Kravitz!

Lawrence, 21, and Kravitz, 23, co-starred as mutants together in 2011's X-Men: First Class -- and then Lenny Kravitz, Zoe's rocker dad, landed the role of Cinna, Katniss' trusted stylist, in The Hunger Games.

"She's a friend of my daughter's," the singer, 47, explained to Us Weekly. "When we all get together, we're quite a silly bunch. So I remember when I got this part, Zoe was like, 'You did? Crap, I wanted to be in that!'"

Lawrence tells Us that she and Zoe (whose mom is Cosby Show alum Lisa Bonet) "always end up on the couch...We're so lazy!"

The stunning Kentucky native says she and her pal got into some G-rated trouble when Zoe visited the Hunger Games set. "We just went to her dad's hotel room and got Gummi Bears and HBO," says Lawrence, who claims she eats an "awful" amount of Skittles, Starbursts and other candy. "We racked up so many charges. Mr. Kravitz was like, 'Did you guys order a lot of room service?!'"

For much more on the movie, including 125 gorgeous photos and exclusive interviews, pick up Us Weekly's Hunger Games special -- available on newsstands now. Order it today!