K-Stew puts R-Patz on a diet

Find out why Kristin Stewart has put her handsome boyfriend Robert Pattinson on a diet.

The 22-year-old actress, who also plays Robert's on-screen partner in the Twilight film franchise, has insisted that he hits the gym to lose the weight he's put on during his time off from acting.

'Robert's put on nearly 10lbs eating cheeseburgers and drinking beer while he's not been working,' an insider reportedly revealed.

'Kristen's told him to pull himself together,' continued the source. 'He hates the gym, so she's encouraged him to take up paddle surfing to try and work off the excess calories.'

Robert has been having time off after filming and promoting Bel Ami.