As photos emerged this week of Nicole Richie bursting out of her bikini top, rumors have been rampant that the reality star has gotten plastic surgery.
The normally flat-chested mother-of-two looked uncharacteristically voluptuous as she lounged in the sun in Los Cabos, Mexico, and a celebrity plastic surgeon told RadarOnline.com that he thinks she has gone under the knife.
"It appears that Nicole Richie's had a breast augmentation," Dr. Anthony Youn (who has not treated the star) told RadarOnline.com in an exclusive interview.
Dr. Youn revealed that the tell-tale evidence lies in the fact that Richie, who will soon appear as a reality television mentor on NBC's Fashion Star, is still slim but much more busty.
"While her weight has stayed the same, her breasts have tripled in size, going from an A to a C cup," estimated Dr Youn.
Richie took the tropical trip south of the border with friends and family, including DJ Samantha Ronson, to celebrate her 30th birthday.
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According to online reports, the vacation was the perfect place to showcase her new breasts and she has been open with pals about getting plastic surgery.
Her curvaceous figure is a stark - but refreshing - contrast to the famous flat-chested images of the former Simple Life star who shocked fans with her stick thin figure a few years ago.
"Her breasts fit her frame nicely, though, and look pretty darn natural. Her plastic surgeon did a great job!" said Dr. Youn.