Robert Pattinson is so “absorbed” with his Twilight costar and rumored girlfriend Kristen Stewart, he has cut off all contact with his friends so he can spend all his time with her.

Stewart, 19, is said to be the hunky British star’s “whole world” — and insiders fear the romance will start to harm Rob’s ability to get his work done.

“Rob’s whole world is Kristen,” a source said. “I’m surprised he even knows his lines because he’s so absorbed with her.

“He has no time whatsoever for his guy friends and has cut virtually everyone off so he can spend every waking moment with Kristen. He’s all about his woman.”

Meanwhile, it has been claimed that Rob is jeopardizing his career by romancing Stewart.

Twilight producers are apparently worried that Robert’s real-life romance with Kristen will ruin the smash hit films — and have told the couple to keep things under wraps for as long as possible.

“The producers took Rob and Kris aside and told them to keep their relationship under wraps for a few more months,” a source told America’s OK! magazine.

“But they’re so much in love, they can’t keep their hands off each other.

“They’re crazy about each other, and they want to shout it from the rooftops.

“But they’re also part of this massive machine called Twilight and producers have this thing timed with scientific precision. They don’t want Rob and Kristen to tell the world about their relationship until the time is right.

“Trust me; Rob generally does what he’s told by producers, but this kid has a strong will of his own, and if he wants to walk around Vancouver with Kristen in front of the world, he’s going to.”

Source: ShowBizSpy