Hills stars Heidi Montag and Spencer Pratt tell Extra they plan to get married on live TV. "I'm just waiting for that big ring," Montag, 21, said in the interview airing tonight. See photos of Heidi & Spencer's cheesiest moments . And Montag – who debuted her new single, "Overdosin ,'" today – says the couple isn't ready to leave The Hills . "No, where would I go?" she responded. (Last month, Montag had explained to Extra that she was " moving out of Hollywood " to get "a break from the drama.") Montag also told Extra that she doesn't let her rift with Lauren Conrad keep her from Audrina Patridge . "We hang out," Montag said. "We're friends… I love Audrina." Watch a sneak peek of the fourth season premiere of The Hills , which starts tonight on MTV. See photos from the new season of The Hills . Tell Us : Would you watch Heidi & Spencer's wedding? ...