"The singer-actress will play the role of Jenny, a guarded gal who comes into the life of Will (Eric McCormack) in an unexpected way," EW reported.
Entertainment Tonight reported that Lovato posted about the news on Instagram with a photo of herself appearing to hold a script on the show's set.
"Will & Grace & Demi," she captioned the image.
The three episodes will air in 2020. No specific air date has been announced, E! News reported.
"Will & Grace" originally aired for eight seasons from 1998 to 2006 on NBC. The sitcom, which stars McCormack, Debra Messing, Sean Hayes and Megan Mullally, returned for reunion seasons in 2017.
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