Remember that time Serena Williams danced with herself for a Berlei bra ad? Dressed in just a well-fitted bra and leggings, the world No. 1 has shared the behind-the-scenes footage from that epic dance routine.

The 35-year-old has been wearing and endorsing the Australia-based bra and underwear company for years, and while she's appeared in plenty of ads for them, none were quite like this.

To the tune of "Dancing with Myself," Williams shows that she's got a lot more talent off the court than anyone could have expected, and proves she can bring her on-court intensity anywhere.