Confirmed: Kristen Stewart was definitely imitating Justin Bieber for her role in Jenny Lewis' "Just One of the Guys" video.

The actress stopped by Conan, where the host asked, "Were you channeling who I think you were channeling?"

"No ... Yeah," Kristen admitted, as Conan added, "It very much felt like you were doing a sort of Justin Bieber ... minus the mustache."

In the "Just One of the Guys" video, Kristen is dressed as a dude, rocking an Adidas tracksuit, complete with a backward baseball cap and fake mustache. She's in full on bro-mode, stoking her 'stache and even pointing down at her crotch.

Kristen also opened up about her love for Jenny Lewis, explaining, "Rilo Kiley is just like my favorite band of all time. I was shocked that I was even able to do [it]. I could barely meet her when I met her the first time and then she's like 'Come be a total goofball for a day. It's just us girls. It'll be so much fun.' I was like, 'If I can breathe enough to do that, then I— ' and I did it. I'm proud of myself."

Speaking of times when Kristen gets nervous, she admitted that her reaction to meeting Robert Redford was telling him, "I feel like I'm going to s--- my pants."

You can watch it all go down in the video above!

See Kristen Stewart + More Child Stars: Then + Now