The Laguna Beach cast is all grown up ... Colletti, which played over Hilary Duff's bop "Come Clean," which served as the series' theme song. Lo Bosworth was noticeably absent from the bash ...

Hilary Erhard Duff is an American actress, singer, and songwriter. Duff has been acting since she was a young child, landing her first major role in 1998 as Wendy in the movie Casper Meets Wendy.