Mandy Moore To Appear on Grey's Anatomy Finale

Grey's Anatomy: We kinda have a teensy little obsession with Mandy Moore here at Team WWK, so this casting scoop made us squee with delight! The always adorable actress-singer-songwriter is slated to guest star on the two-hour Grey's finale May 20, first reported by TVGuide.com. Details surrounding the supersecretive gig are being kept under wraps, but a show rep just confirmed the fantabulous news, telling us Mandy will be playing Dr. Bailey's patient, Mary. The one tease we can give? It's going to be huge!