03/26/2013 04:05 pm ET

Casey Wilson To Guest Star With Keegan-Michael Key On 'How I Met Your Mother'

We don't know if there will be a happy ending in the season finale of "How I Met Your Mother," but there will be a cast member of "Happy Endings" in said finale. Vulture has learned that Casey Wilson (Penny!) and "Key and Peele's" Keegan-Michael Key will appear in the last episode of "HIMYM's" eighth season, airing in just a little over 45 days (May 13, to be exact).

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