AceShowbiz -

Robert Pattinson heated up the Los Angeles set of "Maps to the Stars" with hot, steamy kiss he shared with Mia Wasikowska (pic posted on E! News) on Wednesday, August 21. The actor, who sported a fancy suit that day, was seen laughing with his beautiful co-star during breaks from that make-out scene for David Cronenberg's upcoming movie.

A source on the set tells PEOPLE that the two had to shoot the scene "four times, at three different camera angles." Even so, looking from how the "Twilight" hunk and the "Stoker" beauty managed to joke after that scene, it is clear that two keep their relationship on the just-friends level.

Written by Bruce Wagner, "Maps to the Stars" gives a complex look at celebrity-obsessed L.A. and what it reveals about Western culture. In the story, Wasikowska's character is a criminal pyromaniac who befriends Pattinson's limo driver, who is also an aspiring actor. The project reunites Pattinson with his "Cosmopolis" director Cronenberg.

On why he was keen to reteam with Pattinson, Cronenberg revealed, "I really think he's a terrific actor. He's extremely inventive ... When you find an actor who surprises you everyday, you figure, he could do it some more with a completely different role in a completely different movie."

"Maps to the Stars" also features Julianne Moore, Sarah Gadon and John Cusack.