Heidi Montag Mexico elopement, On-again, off-again couple Heidi Montag and Spencer Pratt are back on - for good. "The Hills" stars tied the knot in an impromptu ceremony on Nov. 20 at the One & Only Palmilla Resort near Cabo San Lucas, Mexico, Us Weekly reports. "The minute we said our vows, I couldn't stop crying," Montag said.The publicity-loving couple surprised fans by keeping a lid on the news for several days, with Montag's rep telling the Daily News on Monday afternoon, "I do not have any information at this time." Now, they're spilling the deets - and Pratt's even sharing the vows he recited to his wife. PHOTOS: WHY ARE THEY FAMOUS AGAIN? "Heidi, from the moment you came into my life, I knew my life would never be the same without you," he said. "You are the light in my life like the sun to the earth! Your loving warmth makes me want to be a better person. Being with you, I feel complete. I'm honor...