By Faith Cummings
Updated Oct 11, 2017 @ 1:15 pm
Vera Anderson/WireImage

Sia wasn't keeping things hidden on Instagram on Tuesday.

The star normally covers up her face with an out-of-this-world wig, but she bared much more than usual in a new social media post.

Makeup artist Tonya Brewer captured the behind-the-scenes moment, in which Sia throws up the peace sign with one hand. Clad in a white satin-y robe and fuzzy pink slippers, the singer looks gorgeous with her hair pulled back into a tight topknot and even under a green face mask. Cleverly, a banana emoji covers her otherwise free nipple.

"She just directed her first film," Brewer captioned the photo. "She had no idea her boob was out. Thank you for letting me create magic with you @siamusic." The snap is indeed magical.

Mum is still the word on when her directorial debut for film Sister with Kate Hudson and Maddie Ziegler will be released. But if there's anything Sia does well, it's surprise us.