Serena Williams may be known for her outrageous tennis outfits, but none of them are as skimpy as this!

Bar Refaeli donned a pair of barely-there boy shorts and a sports bra for a sexy video shoot. The supermodel -- who graced the cover of the 2009 Sports Illustrated Swimsuit Issue -- designed the underwear line, which is also available for men.

Check out Bar's um ... racquet in the clip below.

We can't believe Leonardo DiCaprio gave this up!

For more of Bar's sexy shots, click on the "Launch Gallery" button below!


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