Watch Serena Williams sing topless for breast cancer awareness month

Tennis pro pays homage to Chrissy Amphlett, who died from breast cancer in 2013.

The 37-year-old pro shared on social media that the video took her "out of my comfort zone" but she did it to "remind women to self-check regularly."

"Early detection is key -- it saves so many lives. I just hope this helps to remind women of that," she wrote.

The video is part of the I Touch Myself Project, which was launched in 2014, in partnership with bra manufacturer Berlei and inspired by Australian singer Chrissy Amphlett, who died in 2013 after battling breast cancer and multiple sclerosis.

Amphlett was the frontwoman for the Australian rock band Divinyls, whose biggest hit was 1991's "I Touch Myself." She was 53.

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