If you're like us and value your sleep, you probably nodded off into your Ambien dreamland before the party started on post-prime time TV. Don't worry; we've got you covered. Here's the best of what happened last night on late night.

Will Ferrell visited "The Tonight Show" in a pretty gingham dress and announced that he's the new face of Little Debbie, because apparently he isn't the "Hollywood hunk he once was." Come for the wig, stay for the Oprah impression. One of our favorite running "Jimmy Kimmel Live" skits is Pot Quiz, in which his crew take to the streets and asks pot smokers a variety of topical questions, none of which they can answer. And yes, Willie Nelson makes an appearance this week. It is SXSW after all!
'Jimmy Kimmel Live!': Pot Quiz - South by Southwest Edition
Lena Dunham premiered a new haircut on "Late Night with Seth Meyers!" But more importantly, she chatted about her appearance on tonight's episode of "Scandal" and the amazing wig she has to wear –– which, as you've probably noticed, has quite a presence on Twitter already.Sean Penn got some heat for making a joke about green cards when delivering the Oscar to Alejandro González Iñárritu, but he has no regrets! Check out his response to the controversy on "Conan."