While on vacation in Cabo San Lucas, Mexico, Montag and Pratt elope. "I would be upset if she got married and didn't invite me!" Montag’s father Bill tells PEOPLE. Montag's mother, Darlene Egelhoff, similarly voices her disapproval, even claiming Pratt "drugged" Montag into marrying him. The wedding is filmed for season five of The Hills, but isn't legal in the U.S., as California does not recognize marriages performed outside of the country.
At 22, Montag officially becomes a Pratt when she marries her longtime beau, 25, in an early evening ceremony at the Westminster Presbyterian Church in Pasadena, Calif. The Hills stars exchange vows before about 200 guests, including Audrina Patridge and Brody Jenner.
Montag appears as Playboy's latest centerfold and opens up about being perceived as a TV villain. "If women aren’t jealous of you, talking about you and cutting you down, then you're a nerd," she tells the magazine. "And I would never want to be that." She also reveals that isn't done with plastic surgery and eventually plans to "go bigger" for Spencer.
Montag goes under the knife for a second time – having a staggering 10 plastic-surgery procedures in one day on Nov. 20 – and chronicles her obsession with becoming "the best me" on a cover of PEOPLE. "For the past three years, I've thought about what to have done," she says. "I'm beyond obsessed."
Life takes a rough turn for Montag, who finds herself estranged from those closest to her, including hubby Spencer Pratt. The reality star – who is noticeably absent from the series finale of The Hills – leaves Pratt, before ultimately deciding to file for divorce in July. "We love each other but I'm a famewhore and I'll never grow out of it," Pratt tells PEOPLE. "[Heidi] knows that and doesn't want that."
Though they were headed for divorce, the estranged spouses kiss – and apparently make up – while toasting Montag's 24th birthday in Santa Monica, Calif. Just a week before, Pratt told PEOPLE he "failed spectacularly" during their relationship. "I horribly embarrassed the one person that meant the world to me," he said of Montag, who calls off the divorce. "For my outrageous and infantile behavior, I offer Heidi my most sincere apologies."
BIOGRAPHY (top to bottom): Andrade/Williams/Pacific Coast News; Deano/Splash News Online; Courtesy of Playboy; David Becker/Getty; Pacific Coast News