The release of Sports Illustrated's annual Swimsuit Issue is a big deal in America, sort of like the Super Bowl only with less men in padding and more women in, well, swimsuits.
After Kate Upton revealed she is to be on the iconic cover (for a third time no less) earlier this week, Serena Williams has taken to Instagram to announce she's been involved too.
Dressed in - you guessed it - swimwear, the Greatest Tennis Player of All Time poses against of backdrop of what we think may or may not be the beach at Skegness in mid-October. That or somewhere in the Caribbean, we're not sure.
In any case, Serena's Sports Illustrated appearance is just the latest modelling job she's taken on, recently dancing around in her own lingerie advert too.
Fellow tennis icons Eugenie Bouchard, Caroline Wozniacki and Tim Henman also appear in the issue. Actually we're kidding about one of those.