It looks like reality queen Kim Kardashian has some serious competition from tennis ace Serena Williams

Serena Williams runs a quarter marathon (Image: Splash)

We always thought Kim Kardashian was the queen of the bootay.

But it looks like the reality queen has some serious competition from tennis ace Serena Williams.

The stunning sportswoman spent Sunday morning running a quarter marathon in Miami Beach.

Bootylicious

The star wore a pair of very tight shorts, and a Nike tracksuit top for the sporting event, leaving ALL her curves on show.

Serena tied her hair up in a ponytail and listened to her music through a pair of red headphones.

Sorry Kim, your crown has been lifted (Image: Splash)

The sporting champ wore a pair of green and black Nike trainers and a black Alice band.

And despite recently claiming that her “ass was too big” to run the New York marathon, she looked like she was doing a great job to us.