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So that's her secret!

Kaley Cuoco has just signed on to tout the benefits of acne skin-care line Proactiv, a rep for the Big Bang Theory star confirmed to Us Weekly.

After the news broke Wednesday, Cuoco tweeted she's "so thrilled!!!!" to be a part of the campaign, which has no launch date set as of yet.

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Most recently, Glee star Naya Rivera repped the brand. Past spokespersons for Proactiv have included Jessica Simpson, Avril Lavigne, Julianne Hough, Justin Bieber and Katy Perry.