Kristen Stewart is hooking up with Jennifer Lawrence's boyfriend . . . on the big screen. The 23-year-old actress has signed on to star opposite Nicholas Hoult in the upcoming futuristic love story Equals. In a recent interview with The Associated Press, Stewart explains why she's nervous to take on the part.

"I can't believe I agreed to do it," Stewart told The Associated Press on Monday, Jan. 14. "I'm terrified of it. Though it's a movie with a really basic concept, it's overtly ambitious."

"It's a love story of epic, epic, epic proportion," she added. "I'm scared."

Equals is an adaptation of the 1956 film 1984, which itself was based on George Orwell's classic novel about rebellion in a futuristic society. The project begins filming later this year with director Drake Doremus, who also directed Lawrence, 23, in 2011's Like Crazy.

"I trust Drake's process and I know we will do something really natural and real," Stewart said. "But I told Drake, 'Don't expect that I am going to be able to do this. It's too hard.' But he wouldn't take 'no' for an answer. I've given directors disclaimers before, but never this much."

Doremus has complete confidence in his leading stars, telling The Associated Press, "It became evident in my head that Nick and Kristen would have great chemistry." The director did confess, however, that Lawrence first read the script and was brought to tears by it, but couldn't see herself in the role. (Lawrence and Hoult, 24, rekindled their romance back in July. The X-Men: Days of Future Past costars had previously split in January following a two-year romance. Stewart, meanwhile, split from real-life boyfriend and Twilight costar Robert Pattinson back in May.)

Twilight star Stewart and Hunger Games star Lawrence were rumored to be feuding back in March 2012, but the leading ladies denied the reports and hung out together at the Toronto Film Festival in September. "She's so cool," Stewart told MTV News of spending time with Lawrence. "I was a lot younger than her when I first sort of entered this world of franchise land, and I don't know, I guess we sort of both went, 'Wow, this is so weird.' We were actually sitting in a corner with [Harry Potter star] Emma Watson as well, the three of us. We were like, 'Wow, this is strange. This is really cool.'"

"I think people assume that actresses don't want to [be friends]," Stewart added. "It was kind of a great feeling, to be honest. I was like, 'This is kind of just awesome.'"