Landov; Time Inc. Digital Studio

Last call, lipstick lovers—there’s just one more week to score a free Nars lipstick through our partnership with Saks Fifth Avenue and social networking site Foursquare! (You’ll be in good company sporting the matte formula—Dita Von Teese and Lake Bell are confirmed fans.) Simply sign up for an account at Foursquare.com, follow InStyle, and download the free app to your smartphone. Then take these three steps:

1) Visit a participating Saks Fifth Avenue store in Atlanta, Beverly Hills, Boston, Chicago, New York City, Phoenix, San Francisco, Short Hills, NJ, or Troy, MI.

2) Check in at InStyle-branded hot spots located in four departments throughout the store—in Shoes, Beauty, WEAR and Women’s Contemporary—to unlock exclusive shopping tips from InStyle editors.

3) After visiting two or more hot spots, head to the store’s General Manager’s office, show off your check-ins, and nab that new Nars Pure Matte lipstick (while supplies last)!