The 22-year-old Twilight Saga actress confirmed online chatter that she'll costar with Affleck, 40, in a new romantic comedy Focus.
"I can confirm that rumor," Stewart told HuffPost Entertainment of talk that surfaced in November. "It's a comedy. I'm really excited about it. We start shooting in April."
A month ago, Deadline reported that Stewart was in talks to join the Argo star in the film, playing "an inexperienced con artist who hooks up with the more seasoned Affleck."
With Breaking Dawn: Part 2 promotions over, Stewart is now touting her film On the Road -- with nothing else lined up until April.
"I would love to find some micro-project before then, because April is kind of a ways away," she said.
Affleck is apparently a big fan of Stewart, and admitted mid-November to E! News that he was eager for the actress to sign on to Focus.
"She's terrific and hopefully it will work out," he said.
Tell Us: Will Stewart and Affleck make a cute onscreen pair?