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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.