Serena Williams
Age: 29
Why she's hot: Serena has held the No. 1 rank among female tennis players in the past, and at the moment she's a close No. 2. Also like her sis, she's used her celebrity to break into the fashion scene and often shows up on the court in some unique designs (read: black lycra catsuit). Still, anyone who looks good in a black lycra catsuit has a body to envy.