Anna Kournikova in a white bikini

Anna Kournikova poses for the Sports Illustrated Swimwear Edition's 40th anniversary issue in 2004. This shot was taken from a TV special broadcast on Spike TV. Kournikova was a tennis pro in the late 1990s and early 2000s, known as much for her striking looks as for her ability in whacking a tennis ball. Anna Kournikova was born in 1981, so she turned 23 the year this photo was taken.