Clockwise from left:
Chris O'Dowd: You've seen this lovable Irish actor in Bridesmaids, The Sapphires and This is 40.
Donald Glover: He's written for 30 Rock, starred in Community and in his spare time, he raps under the stage name Childish Gambino.
Jorma Taccone: He is one-third of singing sketch/comedy troupe The Lonely Island (remember "I'm On A Boat" and "I Just Had Sex"?) and is a regular on Saturday Night Live.