The Hills Wraps Up With a Finale Party, Lauren Conrad, and Disguised Spencer Pratt

The guys and girls from The Hills gathered at The Hollywood Roosevelt Hotel yesterday to toast their series finale, which aired last night. You were split on whether or not you'd tune in, but over their four years on the air there have been plenty of dramatic moments. Kristin Cavallari, Audrina Patridge, Whitney Port, Lo Bosworth, and Stephanie Pratt mingled with Brody Jenner and Frankie Delgado on the red carpet, but there was one unwelcome surprise. As rumored, Spencer Pratt crashed the event — no one expected, though, that he'd do so dressed as an old man. His estranged wife, Heidi Montag, didn't attend, but she took to her Twitter to muse on the unexpected turns her life has taken.

Lauren Conrad skipped the red carpet, but she was inside the event to chat with MTV hosts. She raised a glass to the series in a sparkly dress she picked out for the occasion. LC spent her Monday night checking out a Kings of Leon show with pals, but she looked equally happy to reunite with her former costars. She said farewell to the show that helped launch her career, but there's lots more to come for LC with movies, books, and her fashion collection.

To see more from the party, just