Demi Lovato Guest Judges Sleepwear Challenge on 'Project Runway' Tonight

Demi Lovato is all smiles and ready for guest judge gig on Project Runway.

The “Sorry Not Sorry” singer will sit alongside Nina Garcia, Zac Posen and Heidi Klum for tonight’s all-new show.

Titled “We’re Sleeping Wear?”, the ep will concentrate on the Heidi Klum Sleepwear Challenge, and the designers are invited to a slumber party on the roof of the Empire State Building.

Future guest judges include Kelsea Ballerini, Dove Cameron, China Anne McClain, and Sophia Stallone.

Project Runway airs TONIGHT @ 9PM ET/PT on Lifetime.