KATE Hudson accidentally flashed her bum on the set of her new film Sisters.
The 38-year-old was seen filming in a very short red skirt when she bent over and revealed her black pants beneath.
The actress was shooting a scene with co-star Maddie Ziegler on a park bench when she suffered the malfunction - as she bent down to help Maddie who had somehow ended up on the floor.
Kate, who is working on the new project with pop star Sia, looked virtually unrecognisable thanks to having her hair shaved for the role.
The plotline is based on a single-page story that music star Sia penned back in 2007 and centres around a drug dealer and their autistic sister.
Almost Famous star Kate hasn't given away much her secret project with famously private Swede Sia, known for hit track Chandelier.
But an Instagram post from Kate appeared to reveal a screenshot from the film they've made together.
Captioned "Freedom", it shows Kate with her shaved head sitting on a chair and looking out of a window.
Sia recently opened up wanting to make the film, admitting she was ‘embarrassed’ to tell anyone at first.
She told the Hollywood Reporter: "I was too embarrassed to tell anyone I wanted to make a movie because I thought it would be seen as a vanity project because I was a singer.
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"And then last year, after I made the Chandelier video, I realized that I was pretty good at directing, so I felt a little bit braver."
Meanwhile Dance Moms star Maddie Ziegler has hailed Kate her "biggest inspiration" after working with her on the film.
As well as praising Kate, she teased that the venture is something completely unexpected.
She told Entertainment Tonight: "You'll have to see! It's really fun and like I said, it's something completely different and something people won't expect.
"She's amazing I mean she knows how to do everything, she's the most incredible actor and she's probably my biggest inspiration in life - her and Sia, two girl empowerment, they're amazing."
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