Lately, Spencer's wifey's been so busy promoting her Playboy cover (and sizzlin' workout video) that we almost forgot girl's got a new album coming out. Thankfully, this Sunday Heidi's taking the stage and singing her just-released single, "Body Language," at the Miss Universe pageant -- and MTV News has behind-the-scenes pix of the Hillzie hitting the rehearsal studio! Watch Heids practice her dance moves (in a tight tank and booty-hugging sweats!), then tune into NBC Sunday at 9pm ET to see her take centerstage!
+ Want a sneak peek of the action? Get a 40-second preview of Heidi's new jam, "Body Language," plus hear what fans had to say about Pratt's pop skillz.