Guest host Demi Lovato appeared on few episodes of "Will & Grace" this season, and Megan Mullally admitted she didn't know just how big of a pop star Demi was until they worked together on the show. Plus, Megan talked about serenading Justin Bieber on Ellen’s show for his 18th birthday, and her podcast with husband Nick Offerman, "In Bed with Nick and Megan.”

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