VIDEO : Victoria Justice and Gregg Sulkin Face Off in Lip Sync Battle

Victoria Justice and Gregg Sulkin's rivalry is finally coming to a head as they duke it out on Lip Sync Battle. They're not really rivals, but they both got their big breaks acting on rival networks?Justice was on Nickelodeon's Zoey 101, while Sulkin was in Disney Channel's Wizards of Waverly Place. When it was his turn, Gregg put on an outlandish wig to perform a rendition of Kelis' "Milkshake", brought in a real life milkshake and started twerking like his name was Miley Cyrus on an unsuspecting Victoria Justice. The 22-year-old actress responded by turning up the heat with a performance of Nelly's classic "Hot in Herre", full of jaw-dropping sexiness.