"I read that I've just had breast implants – happy to report [I'm] still au naturel," the actress, 45, Tweeted Monday.
Shots of Hurley flaunting her curves while vacationing in Spain last week prompted speculation she had gone under the knife.
But, as she clarifies, her figure isn't the work of a doctor but rather choosing the right swimwear.
"I do wear exceptionally well cut bikinis," she Tweeted. Perhaps even a two-piece from her own line?