![OK Logo](https://okmagazine.com/ok_logo_black_small.png)
Slim Down Like The Stars
![2009__10__simpsonqvcevent.jpg](https://media.okmagazine.com/brand-img/O0w3lB0fY/480x251/2009/10/2009__10__simpsonqvcevent.jpg?position=top 480w, https://media.okmagazine.com/brand-img/O0w3lB0fY/640x335/2009/10/2009__10__simpsonqvcevent.jpg?position=top 640w, https://media.okmagazine.com/brand-img/O0w3lB0fY/768x402/2009/10/2009__10__simpsonqvcevent.jpg?position=top 768w, https://media.okmagazine.com/brand-img/O0w3lB0fY/1024x536/2009/10/2009__10__simpsonqvcevent.jpg?position=top 1024w, https://media.okmagazine.com/brand-img/O0w3lB0fY/1280x670/2009/10/2009__10__simpsonqvcevent.jpg?position=top 1280w, https://media.okmagazine.com/brand-img/O0w3lB0fY/1440x753/2009/10/2009__10__simpsonqvcevent.jpg?position=top 1440w, https://media.okmagazine.com/brand-img/O0w3lB0fY/1600x837/2009/10/2009__10__simpsonqvcevent.jpg?position=top 1600w, https://media.okmagazine.com/brand-img/O0w3lB0fY/2160x1130/2009/10/2009__10__simpsonqvcevent.jpg?position=top 2160w)
Oct. 29 2009, Published 4:59 a.m. ET
Too busy to hit the gym? Stars like Jessica Simpson, Lady Gaga and Alicia Keys have found a quick and easy way to stay fit, thanks to Harley Pasternak. The trainer created the following 45-minute circuit training session to sculpt these super-busy A-listers. It gets results, can be done anywhere (backstage or in a hotel room) and fits into the most hectic of schedules.
CHECK OUT THE GALLERY TO SEE HOW HARLEY PASTERNAK WHIPS HOLLYWOOD'S HOTTEST SINGERS INTO SHAPE!