Kristen Stewart furious about Robert Pattinson dating Katy Perry
Our source says she's 'angry, jealous and feels Katy's steaming in on her man'.
Katy made a real effort to look hot for the Twilight actor.
'She was sat across from Rob but later moved next to him,' a source told The Sun.
was laying on the charm and playing the minx - tossing her head back,
laughing at his jokes, touching his arm and twirling her hair.'
Read more about Kristen Stewart and Robert Pattinson in Now magazine dated 10 September 2012 - out now!