Glee celebrated its 300th musical number yesterday!Full HouseWednesday’s celebration, which took place after the mash-up performance of Adele’s “Rumor Has It”/”Someone Like You” was filmed, brought out the bulk of the cast, including Kevin McHale, Cory Monteith, Harry Shum Jr., Idina Menzel, Dianna Agron, Damian McGinty, Amber Riley, Mark Salling, Darren Criss, Chris Colfer, Heather Morris, Naya Rivera, Lea Michele, Matthew Morrison and more. (source: THR)All the pictures here