Kristen Stewart is said to be just as impressed with Robert Pattinson's new buff body as everyone else.

A new report claims that Rob's rumoured crush on Kristen has been in effect for some time now, but she has only lately succumbed to his charms - which have become more manly in recent weeks.

An insider tells the NY Daily News: "Robert is obsessed with Kristen and has been for a while. He likes that she's a cool, down-to-earth girl.

“Kristen never saw Rob as anything but a friend, but that seems to be changing."

Kristen isn't the only fan of Rob's newly toned physique on the New Moon set.

"Taylor [Lautner] been training Rob a lot, and that's why he's got such ripped abs," says Kellan Lutz, who plays Rob's vampire brother Emmett.

"Rob's been working hard. He's trying to be the best Edward [Pattinson's character in the films] he can be."

The NY Daily News also refers to Rob and Kristen's post-MTV awards 'date' night, claiming that the pair held hands throughout their meal at Cecconi's.

See Rob & Kristen at the MTV awards