Steadily rising up the comedy ladder with appearances on the cult U.K. hit "The I.T. Crowd" and 2011's "Bridesmaids," this Irish comic actor is something like a mix of the goofy physicality of Will Ferrell with a dryly rumpled delivery of a pre-overexposed Seth Rogen. You can catch him on TV with a run on HBO's "Girls" as well as the lead in its new series from Christopher Guest, "Family Tree," and look for him to keep rising elsewhere soon.
Suzanne Tenner / HBO
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