She's a seasoned cover model since appearing on the front of Vanity Fair in her lingerie last year. Now, Caitlyn Jenner is set to strip off altogether for a risque Sports Illustrated summer cover.

According to US Weekly, a starkers Jenner will pose nude sporting nothing but an American flag and her Olympic model, leaving little to the imagination.

The 66-year-old former athlete and star of reality shows I Am Cait and Keeping Up With The Kardashians this year celebrates 40 years since she set a world decathlon record at the 1976 Montreal Summer Games - then known as Bruce.

A source reportedly said Jenner was "excited" to pose with her gold medal for the first time since her transition, which had been tucked away at the bottom of her makeup drawer.

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Jenner has been a strong advocate for the trans community and LGBT rights since she revealed her new name last year.

Last month, Jenner scored a victory of sorts amid USA's heated transgender bathroom debate when Donald Trump declared she could use the bathroom of her choice at Trump Tower.