Kristen Stewart Places 'Breaking Dawn' Sex Scene Blame on Robert Pattinson: "He's the Thruster!"

After Robert Pattinson appeared on Jimmy Kimmel Live! on Wednesday night, Kristen Stewart stopped by Thursday night. The Twilight Saga: Breaking Dawn - Part 1 star had to defend herself against his claims that she caused the sex scene to initially get an R rating.

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Jimmy Kimmel quickly questioned Kristen on the birth scene, wedding and "sex humping" scene.

"It was pretty explicit and I was suprised at how explicit it was, but Rob said that it was even more explicit than we saw," Jimmy explained on his show. "And that you wanted it to be more explicit but someone came in an put a stop to all the thrusting."

"He's the thruster!" Kristen argued about Rob. "It's obviously not me."

"What takes you from a PG-13 to an R rating?" Jimmy asked.

"Noises," Kristen shyly whispered.

"I think if you see the result of...." she tried to continue to explain by pounding her fist into her hand. "You know what's going on if you go... (makes a face)."

"So you have to keep it pretty quiet," Jimmy helped her. "Like teenagers in the backseat of a car while mom and dad are still in it."

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Watch the interview clip, below!