News Grease: Live Co-Stars Vanessa Hudgens and Julianne Hough Show Off Their Incredible Abs on Instagram By Rita Kokshanian Rita Kokshanian Rita Kokshanian is a Los Angeles-based writer and editor who covers celebrity, fashion, beauty, and lifestyle. She was previously an Assistant Editor for InStyle and is currently the Senior Copywriter at The Grind. InStyle's editorial guidelines Updated on January 13, 2016 @ 12:30PM Pin Share Tweet Email Photo: David Livingston/Getty Images, Jason Merritt/Getty Images It looks like all that rehearsing is paying off. Julianne Hough and Vanessa Hudgens are poised to take the stage on Jan. 31 to play Sandy and Rizzo respectively in Fox's Grease: Live, and it's safe to say they're going to look good while doing it. On Tuesday, Hough took to Instagram to share a photo of the two showing off their incredible physiques on set. "#GreaseLive," the Dancing With the Stars judge simply captioned the black-and-white pic, along with a series of emojis. In the 'gram, both Hough and Hudgens are wearing what look like 1950s-style petticoats and crop tops that show off their rock-hard abs. Excuse us while we hit the gym, stat. Grease: Live Releases First Full Cast Photos Grease: Live is set to air on Fox on Jan. 31 at 7 p.m. ET. So far, we've gotten a look at the trailer, as well as photos of the entire cast. We can't wait to see the action unfold on TV!