Kristen Stewart will reportedly be going for the wow-factor at this week's Comic-Con International in San Diego in a bid to “win back” Robert Pattinson.

After completing filming on Twilight sequel New Moon in May, the co-stars – and rumoured real-life couple/hook-up – have spent the summer shooting movies on opposite US coasts.

Kristen has been in Los Angeles playing rocker Joan Jett in The Runaways, whilst Rob has, of course, been shooting Remember Me with new leading lady Emilie de Ravin in New York.

And according to the latest issue of US OK!, it's not just Twi-hards who are eagerly anticipating the big Rob/Kristen Comic Con reunion.

“Kristen’s got too much going for her to come in second,” a source close to the 19-year-old actress tells the magazine.

“She really cares for Rob, and if he still feels the same, she wants their relationship to progress. The Comic-Con reunion will be a real test.”

Kristen is said to feel threatened by Rob's reported chemistry with Aussie actress Emilie.

The source adds: “She’s seen photos of them sitting with Emilie’s hands resting tenderly on Rob’s arm, and she sees the way Emilie looks at Rob.”

Kristen's masterplan? At the insistence of pals including Runaways co-star Dakota Fanning, she will be pulling out all the stops to reel Rob back in when they come face to face at the convention.

“Her friends are insisting she look as hot as she can when she and Rob see each other so he will fall head over heels with her all over again,” says the insider.

“She wants to look so amazing that Rob won’t be able to take his eyes off her.”

With Comic Con kicking off tomorrow, stay tuned for more Rob and Kristen news.

Rob and Kristen's awards tease