Kristen Stewart Justin Bieber Joke: 'Twilight' Actress Mocks Justin Bieber In Music Video? Read The Transcipt Here!

Kristen Stewart made a guest appearance on "Conan" last Wednesday and poked fun at pop star Justin Bieber.

The actress was asked by host Conan O'Brien about her recent appearance on singer Jenny Lewis' music video "Just One Of The Guys."

The video featured K Stew dressed as a guy in an Adidas track suit, a cap and sporting a thick moustache. Conan found the performance quite impressive. In fact, the host noted that Stewart looked and acted a lot like Justin Bieber.

"There was some Justin Bieber in there," he said. "Minus the moustache"

To this statement, Kristen shot back, "In his dreams."

"I didn't even mean that," the "Still Alice" actress said, backpedalling. "I don't even know where that came from."

"That was such a cheap, stupid joke," the actress continued.

The actress then shared how she was obsessed with Jenny Lewis' band Rilo Kiley. She revealed that she could not even breathe the very first time she met the singer. But she channelled all this nerve into her performance as a guy in the music video.

Conan then noted that it wasn't the first time that he had the seen the actress acting nervous and awkward in the face of celebrities, especially the ones that she admired.

"[My awkward moments] are so rare obviously, so few and far between, that we might as well mention them on TV," she said in mock seriousness.

When asked to mention any other celebrity encounters in which the "Twilight" actress had an awkward encounter, Stewart recounted the story of meeting Robert Redford.

The 25-year old shared that she was starring in a film that had its debut at the Sundance Film Festival, when she met the actor. Redford asked her about how she was feeling at that time.

"'I feel like I'm gonna s--t my pants,'" the actress said.

The actor then replied, "'Good, that's how you should feel,'" he said.