Lauren Conrad plans to open up about what really went down during the filming of The Hills.

The former reality star hosts the new MTV special, The Hills: That Was Then, This Is Now, and in a teaser for the TV event she assures fans that she will "reveal things that we haven't talked about before."

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"So often, we would say, 'If you knew the real story, you would understand,'" Conrad says in the promo. "And what I would like to do is tell that story."

Get ready to "feel the rain on your skin" again when the special airs on Tuesday, Aug. 2, on MTV.

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May 31 marked the 10-year anniversary of the show's premiere, and ET caught up with several cast members of The Hills who shared their behind-the-scenes secrets.

Conrad hated hard on Spencer Pratt, her pal Heidi Montag's boyfriend (now husband), during the course of the show, but he admitted to ET that they got along at first. "Initially, off camera for that whole summer, we were double dating -- Brody [Jenner], Heidi, Lauren and I. Everything was great. And then when Brody and Lauren stopped [dating] -- yeah, they kept kind of faking it for the show -- [we're] like, 'Oh, we're friends,'" he disclosed. "Once it was clear that they weren't going to work out, Lauren wanted her wing woman back."

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Here's a few more shocking revelations from The Hillscast: