Caroline Wozniacki Ventures into Fashion: Tennis Star to Launch Underwear Line in September [PHOTO]

Tennis star Caroline Wozniacki announced Tuesday she is launching an underwear line in September called "This is Me."

The world's No. 9 player said she will design the collection with the help of Danish brand JBS. The line will include hipsters, g-strings and bras.

Wozniacki promises her line will be perfect "for the girl that wants good looks from fashion, a perfect fit for her body, and a quality that's hard to beat," according to a press release.

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Wozniacki is her own line's underwear model.

In a sexy black and white ad for the collection, she is laying on one side with her hair loose.

Other tennis stars like Rafael Nadal have posed for underwear lines.

Wozniacki is the second highest earning female athlete in the world, according to Forbes in 2011. She is also the world's ninth most marketable athlete, according to SportsPro magazine in June 2011.

She is currently dating professional golfer Rory McIlroy.