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But everything changed for the dynamic duo when a certain someone named Spencer Pratt came into the picture. "He's a sucky person," LC once tearfully told her former pal.
When Heidi moved out to live with Spencer, fans of the show figured the two could remain friends despite their very different feelings on Pratt. But once the rumors — presumably started by Spencer — started swirling that LC made a sex tape with former boyfriend Jason Wahler, the friendship fizzled.
"You know why I'm mad at you. You know what you did," LC told Heidi, who seemed to not fully understand why the pair had grown so far apart.
The two remained on bad terms despite Heidi's attempts at a reconciliation, which included the statement, "I really am sorry for all that you've been through." LC's reaction? "I want to forgive you and I want to forget you."
"The only thing really missing in my life is you and I don't think that's gonna change anytime," Heidi explained to LC.
However, fans were shocked when Heidi showed up unexpectedly at LC's party, facilitating a tearful reunion. "My favorite stories are my stories with you," Heidi cried to Lauren. "My favorite memories are my memories with you."
Although the two never got as close as they once were, Lauren managed to put aside her feelings for Spencer to attend her former best friend's wedding. LC told Heidi, "I just realized regardless of everything that happened I'm just — I really am happy for you."
LC later spoke to MTV News about why she made a cameo at the wedding. "We don't really have a relationship," she said. "We're friendly with each other. I don't have a problem with her, but, you know, we're not great friends."
What are some of your favorite "Hills" moments? Let us know in the comments below!
"The Hills: Final Season" premieres Tuesday at 10 p.m. ET/PT followed by "The City" at 10:30 p.m. ET/PT on MTV.