The show is being directed by one of her best friends - and her stylist - William Baker, and is showing at the Garrick Theatre.
Kylie kind of stole the show in a backless cream Pucci spring 2011 minidress, with a sexy cutout back.
She teamed the look with killer nude Louboutin heels, and a cute tousled updo.
Kylie took a night off from her Aphrodite tour to support her friend's new endeavour, which stars Miss Polly Rae, who created the show five years ago at Soho Revue Bar.
What do you think of Kylie's opening night look? Leave a comment below...