Diet and exercise are not words in Blake Lively's vocabulary.

"I do panic before I have to wear a really skimpy outfit, but I don't have enough willpower," she says of dieting in the August issue of UK Glamour Magazine.

"I had to do a scene in a bra and shorts for the first time in two years ... On the day of the shoot, I ate a pork burrito, chips and a coke. Afterwards, I thought, 'I probably shouldn't have done that.' But hey, whatever."

Not only does she eat whatever she wants, she doesn't even work out!

"I have never worked out, but I know you always feel better when you do," the 21-year-old Burbank, Calif., native says, "so I am planning on getting a trainer.”

Some girls have all the luck ...

The absurdly sexy Blake Lively says despite all the cattiness that exists in Gossip Girl, on and off the set, she gets along very well with other members of the cast.

"We hang out after filming, and we actually all look forward to spending time together outside of work," says Blake, who celebrates her birthday next month.

That includes her real-life leading man Penn Badgley, though she admits it wasn't always the case - she was not happy when he was first cast on the series!

"At first I was so upset that they hired him," she says.

"I actually poisoned the whole cast against him. But then they noticed that he was not a jerk and was actually a really nice, charming person. Almost immediately I realized that too, but it took me about a week to admit it."

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.