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Kristen Stewart impressed by Taylor Lautner

Oct 25, 2009, 6:00 GMT

09/25/2009 - Taylor Lautner - The \'Twilight Saga: New Moon\' actress is impressed with the way her hunky co-star has improved as an actor and bulked up for the upcoming installation of the vampire thriller franchise. © Bob Charlotte / PR Photos

Kristen Stewart is "astounded" by Taylor Lautner's new muscular physique.

The 'Twilight Saga: New Moon' actress is impressed with the way her hunky co-star has improved as an actor and bulked up for the upcoming installation of the vampire thriller franchise.

She told Total Film magazine: "The cool thing is that it's not just physical. You can read it all over him, just in his entire attitude. The difference between the kid that did 'Twilight' and this guy now is pretty astounding."

The couple first worked together when they filmed last year's hit romantic fantasy film and have spent the past few months shooting love scenes for the sequel - which focuses around the relationship between his werewolf character Jacob and her alter-ego high school student Bella.

Taylor, 17, admits it was a struggle for him to get in shape for the highly-anticipated follow-up.

He said: "When I was filming 'Twilight', I knew that Jacob's character changed a lot so if I wanted to continue portraying him correctly, I had a lot of work ahead. So I started hitting the gym. I got a personal trainer. I started eating a lot of food and cut the sugars. It was a lot of work, but it was definitely worth it."