Want to show off sexy stems like Drew Barrymore's at this month's holiday parties?

New York City Bar Method studio owners Amy Duffey and Kristin Kelleher recently invited Us Weekly to their SoHo facility, where they demonstrated how to get the 36-year-old star's red carpet-ready physique.

Watch the video (above) for a step-by-step guide to shape your quads and backside using their Diamond Thigh techniques.

For more about the Bar Method -- and to find studio locations -- visit their Web site.