Jennifer Lawrence certainly played it cool while she was backstage at the 2014 iHeartRadio Music Festival in Las Vegas this weekend, especially when her new boyfriend Chris Martin was close by. The 24-year-old looked fantastic for her big night out in Sin City in an Emilio Pucci studded crop top, black skinny jeans and strappy Valentino heels. She paired the look with tousled curls, a pink Dior earring, and a metallic pyramid purse.