"We met on the movie. Everyone thought we dated on the movie and we didn't, not for a long time after," Roberts revealed on the Wednesday, Jan. 29, episode of E!'s Chelsea Lately. "I actually, on the set, was like, 'Oh yeah, we're totally gonna date.' And I would like flirt with him, which ended up looking like I had something in my eye because I'd be like, 'Hey, what's up?'" she recalled, batting her eyelashes. "And he literally didn't speak to me the entire movie. He thought I was so weird."
Roberts' movie wardrobe didn't exactly encourage Peters to make a move. "I had no makeup, it looks like I cut my own hair off, so I was not exactly looking cute to get a man," she joked.
Host Chelsea Handler then asked the actress who decided to pursue the other. "Definitely not me! I'm a lady," Roberts giggled. "He texted me and then we got together."
Not long after they wrapped production on Adult World, Roberts was cast in her love's TV show.
"They asked me to be on American Horror Story, and it was actually one of my favorite shows. They said this season was going to be Coven, and I was obsessed with every witch show as a kid, so I was like, 'If I get to play a witch, yes, I'm in.' And I got to play a witch who's also a bitch, which was really fun, because I get to be really mean to everyone all day. That was a pretty fun character to get to do."
For more from Roberts—including her One Direction obsession—watch the video above now.