Jessica Alba went all out for her 36th birthday. On Friday, the actress and Honest Company founder hosted a "Prince vs. Michael Jackson" dance party at The Peppermint Club in LA, and among the guests were close friends Nicole Richie and Joel Madden, Cameron Diaz and Benji Madden, Jaime King, Shay Mitchell, and Beyoncé! The pregnant singer was spotted leaving in an MJ-style black fedora and sparkly coat with BFF Kelly Rowland. Jessica was dolled up in a low-cut black jumpsuit, while her husband, Cash Warren, took it one step further in a printed Prince getup. The couple is clearly on a theme party kick, as they threw a pajama bash for Cash's birthday back in January. Scroll through for all the photos from Jessica's star-studded event.