KJ Apa dresses as viral musical persona Mr. Fantasy for producer Jennifer Klein ‘s annual holiday party in Los Angeles on Saturday night (December 6).

The festive celebration brought out a huge crowd of celebrities including Vanessa Bayer , Beck , Coby Bell , Tiffany Boone and Marque Richardson , Cameron Crowe , Greg Tarzan Davis , Jay Ellis , Scott Evans , William Fichtner , Josh Gad , Topher Grace , Max Greenfield , Jay Harrington , Charlie Hunnam , Katie Lowes and Adam Shapiro , Bill Maher , Richard Marx and Daisy Fuentes , Isabela Merced , Thomas Middleditch , Kevin Miles , Lamorne Morris , Tia Mowry , Niecy Nash and Jessica Betts , Ray Nicholson , Yvonne Orji

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