Washington, Apr 18 (ANI): Robert Pattinson is reportedly so 'insecure' about his chest that he got 'upset' when pictures of him paddle-boarding without a shirt hit the newspapers.

The 25-year-old 'Twilight' star apparently hates his upper half so much that he got deeply upset when pictures of him paddle-boarding with his bare chest in Malibu hit the media.

He's really insecure about his shirt being off, the Daily Star quoted a source as saying.

The actor is believed to have taken up the sport after being urged by girlfriend Kristen Stewart to lose a few pounds.

Robert's put on nearly 10lbs eating cheeseburgers and drinking beer while he's not been working, a source said.

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