The star of "The Office" and one of Ellen's favorite guests all season, ELLIE KEMPER is back with details about her exciting wedding plans! She's also about to get a very special bachelorette surprise from Ellen that will have your jaw on the floor! Then, the 2012 Teacher of the Year, REBECCA MIELIWOCKI is here. It's no wonder this outstanding educator was awarded teaching's highest honor. Her spirit, positivity and enthusiasm are nothing short of inspirational. She's telling Ellen about her thrilling day at the White House, and will receive a very special and moving surprise! Plus, revered singer/songwriter RUFUS WAINWRIGHT makes his first ever appearance on Ellen to perform a song from his new album. It's a Memorial Day show you'll always remember!