Jealous Robert Pattinson wants to monitor Kristen Stewart’s sex scenes?

UNIVERSAL CITY, CA - JUNE 06: Robert Pattinson and Kristen Stewart accept the Best Kiss Award onstage at the 2010 MTV Movie Awards held at the Gibson Amphitheatre at Universal Studios on June 6, 2010 in Universal City, California. (Photo by Christopher Polk/Getty Images)

A report has suggested that Robert Pattinson is concerned about Twilight co-star and rumoured girlfriend Kristen Stewart’s upcoming sex scenes in On The Road – so much so, that he plans on watching them being shot.

Apparently it isn’t even the hot young actors, like Garrett Hedlund and Sam Riley, that are worrying him, his real concern is with Viggo Mortensen – who, at 51-years-old, is more than twice Kristen’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 told HollywoodLife.com.

“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.”

According to the report, Mr Pattinson is also annoyed that Kristen took on the role 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!”

“He’s very jealous,” the insider continued. “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.”