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Rumour has it that Cameron Diaz has undergone a breast enlargement surgery after her latest outing in a tiny bikini.

The Charlie's Angels star was spotted on the beach in Hawaii over the holidays looking rather shapely, which sparked speculation that she has gone under the knife.

According to the National Enquirer, the 39-year-old actress has reportedly had implants to boost her chest by a cup size.

"I believe she has had a breast augmentation using relatively small silicone implants," the Daily Mail quoted plastic surgeon Dr Anthony Youn, who has not treated the star, as telling the publication.

"Since swelling can take severely weeks to settle down, I suspect she had the surgery at least two to three weeks ago," he said.

Cameron has previously said she would prefer a more curvy figure in 2009.

"I'd love to be more voluptuous. It's just not my body type," Diaz told Marie Claire.

The Bad Teacher star, who had her nose fixed in 2006 after breaking it four times, said in 2010 that she would rule out more surgery.

"Yeah, well, hey. I'm not doing anything right now," she told British Vogue.

"But we'll see. So far, so good. But I'll never say never to anything," she said.