Matthew Morrison's Star-Spangled Halloween/Birthday Party

Matthew Morrison had double the reasons to celebrate in L.A. last night — not only was it Halloween, the event every celeb in Hollywood seems to love dressing up for, but it was also his  birthday on Saturday! Matthew turned 32 in style at his party presented by Onitsuka Tiger and vitaminwater at Voyeur in L.A., with plenty of famous faces around to help celebrate!

OK! GALLERY: CELEBS CELEBRATE WITH THEIR BEST HALLOWEEN COSTUME!

Glee co-stars Chord Overstreet and Harry Shum Jr. had fun dancing, while Chad Michael MurrAy and his fiance Kenzie Dalton also posed for pics.

OK! GALLERY: HEIDI KLUM TOWERS OVER HER HALLOWEEN PARTY IN ROBOT COSTUME

Christina Aguilera, JC Chasez and Lauren Conrad also arrived to wish the birthday boy well and show off their creative outfits!