Oops! Britney Spears suffered an embarrassing hairstyle malfunction when a huge clump of her blonde hair fell out partway through her Piece of Me show in Las Vegas last weekend.

The mom-of-two was performing her song "Do Something" on Friday, Feb. 27, when a mass of blonde hair extensions became detached from her head and attached itself instead to the back of her sexy black catsuit.

As a fan video shows, the former Mouseketeer continued her performance with the utmost professionalism, seemingly oblivious to the addition of a blonde tail on the back of her outfit.

As she walked across the stage, the wig-like tresses came loose from her costume and fell to the floor.

Spears chopped her trademark long locks into a short blonde bob back in September, but evidently still enjoys rocking an enhanced, long-haired look for her Las Vegas shows.

The 33-year-old singer has recently signed a new residency deal with Planet Hollywood, extending her Vegas Piece of Me show through 2017.