Happy Birthday, Botox! The face-freezing neurotoxin turned 10 years old over the weekend, and it has plenty of reasons to celebrate.

SODAHEAD SLIDESHOW: See the stars who've admitted that they've used Botox. 

First of all, the American Society of Plastic Surgeons recently reported that Botox was the most popular "minimally invasive" procedure in 2011. Secondly, celebrities are no longer trying to hide behind their frozen foreheads -- more stars than ever are admitting that they've gone under the needle, including Jennifer Aniston, Simon Cowell, and Jenny McCarthy, Yahoo! Shine reports.

PHOTOS: See the latest celebrity pictures to hit the Internet. 

We've also dug up a few more celebs who admit to having injections here and there -- including Kim Kardashian (at the wee age of 31), Cindy Crawford and Kylie Minogue. From Kim to Jen to Cindy, let us know: Which Botox-using star looks the best?

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<a href="http://www.sodahead.com/entertainment/stars-whove-used-botox-who-looks-the-best/question-2594117/" title="Stars Who've Used Botox: Who Looks the Best?">Stars Who've Used Botox: Who Looks the Best?</a>