Kesha was a guest judge in an episode of Project Runway All Stars, titled "Once Upon a Runway".
"Once Upon a Runway" is the 8th episode of the 5th season of Project Runway All Stars. It aired on March 31st, 2016. Kesha was a guest judge along with Brad Goreski.
In the workroom, Sam and Kini engage in a showdown over who's doing better in the competition; Kini attests that Sam is the only remaining "saved" designer, and implies that he'll soon be eliminated. Sam responds that he's won two challenges in the competition, and mocks Kini's insinuation by reminding him that he has yet to win a challenge. Kini shoots back by recalling his season, where he won three challenges (one tie win, one group challenge win, and one individual win) and also made it to fashion week, seemingly unaware that Sam was 1st runner-up on Under the Gunn. This also brings about the season long debate about the Little Big Town challenge, and whether Kini made Sam's look. Sam attests that Kini made the top for his garment, but the rest was his design, seemingly ending the discussion.
On the runway, Asha, Dom, and Kini land themselves the top spots, and Sam, Layana, and Alexander wind up in the bottom. Asha is commended for her modern take on elegant princess wear, whereas the judges praise Dom for going more casual with her design. Kini is told that he has a very interesting idea, but the judges don't quite know what to make of it. Kini is called as safe, leaving Asha and Dom as the top two, with Asha ultimately taking her second win of the season.
On the bottom, the judges like Sam's approach, but the construction is off, and Georgina and Alyssa agree that he's "phoned it in" this week. However, he's called safe, leaving Layana and Alexander in the bottom two. Alexander is chastised for under-designing, despite his costume background, as well as designing old. Layana finds herself in the bottom 3 a third straight week, with the judges declaring her dress "a sale rack" dress, but she is saved, and Alexander is eliminated.