25 Star-Tested Beauty Tips & Tricks

We got the inside scoop on Taylor Swift's stunning cat-eye, Jessica Simpson's gorgeous updo and more celeb hair and makeup looks. Check out their top get-gorgeous secrets!

  • ROLL TAPE! photo | Jessica Simpson

Credit: Jamie McCarthy/WireImage

Updated: Tuesday Dec 13, 2011 | 06:00 AM EST By: Alex Apatoff & Zoë Ruderman

ROLL TAPE!

The easiest way to test whether your skin needs a good buffing? "Apply a piece of clear tape to an area of the face. Rub [it], leave on for three minutes and remove," says celebrity esthetician Renée Rouleau, who has worked with stars like Jessica Simpson. "If you can see flakes of skin, then it's time to use a mild facial scrub or an exfoliating acid serum."