The 27-year-old singer took to Instagram to share a photo of herself cuddling her fake baby bump ahead of her guest appearance on the show 'Will and Grace'.
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"Real or fake?... #WillandGrace #MeetJenny," Demi wrote along with the post.
Demi had revealed back in August about her appearance in three episodes of the final season of the hit comedy series.
Her character, Jenny, is described as "a guarded gal who comes into the life of Will (Eric McCormack) in an unexpected way."