Robert Pattinson is worried that his rumored girlfriend Kristen Stewart will end up falling in love with their Twilight costar Taylor Lautner, it has been claimed.

A source told American tabloid Star that Lautner, 17, “definitely has a crush on Kristen. She treats him like a little brother.”

The publication also claims Taylor and Kristen, 19, were “inseparable” during the Teen Choice Awards in Los Angeles Sunday.

Kristen’s close relationship with the bulked-up teen, the insider says, has Rob running scared.

“Rob is really nervous that Kristen will fall for Taylor’s charms,” a source said.

So it’s no wonder the 23-year-old British actor is doing his best to keep hold of his woman.

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