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Posted Fri, September 3, 2010 9:15am EST

EXCLUSIVE! Robert Pattinson Is Freaking Out About GF Kristen Stewart's Sex Scenes With 'On The Road' Co-Star Viggo Mortensen!

Robert Pattinson is so worried about hanky panky going on during his girlfriend’s racy scenes with Viggo that now he’s planning on hanging out on-set…ALOT

Guess what, BFFs? Robert Pattinson is JEALOUS over one of  GF Kristen Stewart‘s good-looking new male co-stars — and it isn’t the young and hot Garrett Hedlund or Sam Riley, either! Nope, his real beef is with Viggo Mortensen – who, at 51, is more than twice K-Stew’s age!

Rob plans on being on the set of On the Road, not because he has a role in the drama, but because Kristen has a real risque part!” an insider tells HollywoodLife.com exclusively. “There are a lot of sex scenes including a threesome, and Rob wants to make sure that it’s all pretend from the start and finish of the film.”

Furthermore, the 24-year-old British hunk wasn’t happy that Kristen, 20, decided to take the role of  sexually promiscuous young Marylou Moriarty, the wife of Garrett’s troubled drifter, Dean, in the big screen adaptation of Jack Kerouac‘s Beat Generation novel in the first place!  “He didn’t like that Kristen was even considering taking this role. He understands that she doesn’t want to be known as just Bella from Twilight, and he’s doing the same thing with his own career, but he didn’t take on a role as risque as hers!”

The fact that sexy Viggo is in the film as Old Bull Run, a married druggie pal of Dean’s, is causing a rift between the Twilight lovers. “He’s very jealous,” our insider says. “Kristen told him she didn’t want him on the set because it would make her feel uncomfortable, but Rob said he’s going to be there. Especially now that her scenes are with Viggo, who is very very hot! Rob is free until filming begins on the next Twilight film, so he’s got all the time in the world to keep an eye on Kristen – and he will.”

Although Kristin and Viggo don’t have any sort of love scene in the film, Rob may be jealous because Viggo is an artistic, romantic, brooding guy like himself – just way, way older. Still, we think Rob may need to take a reality check on the jealous behavior! Viggo may be hot – but he’s old enough to play Kristen’s DAD. You’re way hotter — stop worrying!

Click for MORE pics of Rob and Kristen!

Laura Schreffler