George Clooney broke up with his model girlfriend, Sarah Larson, shortly after she had a breast augmentation in mid-May.

Was surgery the final straw in their already fractured relationship? “George really didn’t want her to get the boob job,” an insider says. But she needed a place to rest after the operation. “She asked George if she could do her recovery at his house and he agreed,” says the insider.

Although the couple made a last appearance together at a Metropolitan Museum of Art gala on May 5 in New York, the relationship was already on the rocks. “He wanted to break up with her but she had an Armani gown custom-made,” says the insider. “He didn’t want to be a jerk, so he took her to be nice.” But the romance lasted just a few more weeks.

Despite the split, the 29-year-old former cocktail waitress is pleased with her new look. Revealing no signs of heartache, Sarah showed off her curvier figure at the Palms Place Hotel and Spa opening in Las Vegas on May 31 (pictured above).

“She likes her new body so much that she would consider posing for Playboy,” says a friend. And having dated a huge star, she shouldn’t have any problems getting work. “Now that she’s famous, she’d never go back to cocktailing,” the pal says.

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See Sarah pre-boob’s after the jump! (She really was flat!)