Serena Williams, super hero or super sleeper?

serena-williams-super-instagram.jpg Serena Williams has probably been accused of having superpowers. After all, she's one of the world's top tennis players. But in a picture Williams posted to Instagram on Thursday (Dec. 15) she reveals what we're assuming is her secret identity. Or just some really cute pajamas.

In the photo, Williams sports a onesie emblazoned with the Superman logo and topped off with a red cape. She's poised for takeoff on what we can only assume is a flight to reverse the earth's rotation in order to save Hoover dam or, you know, something.

Williams did address the mysterious get-up on Twitter, but didn't really explain it:

"@jsmoll just asked me where I got my superman onzie," she tweeted. "She said she wants to get it for her 5 year old nephew.. I need to rethink my lingerie."

Nah, we think it's just fine, Serena. Now your on-court outfits? Entirely different story.
Photo/Video credit: Instagram