Who's this Baltimore celeb with the fancy feet?

Can anyone guess which big-name in Baltimore showed up at an awards dinner Monday night sporting this fancy footwear?

Hint: It's a man.

And another hint: You usually see him barefoot.

The socks with the Piet Mondrian color scheme were found on the feet of gold medalist Michael Phelps. 

The Olympian wore the jazzed up footwear Monday night in New York City for the American Apparel & Footwear Association's American Image Awards.

Phelps received the organization's Humanitarian Awards for work his Michael Phelps Foundation did with young people.

Phelps attended the event with his mother and sister, Hilary, who snapped the picture of her brother's feet and posted it on Twitter with the message: "Rad socks & chic @LouisVuitton shoes. Guess who?"

One fan Tweeted back: "no way! hahaha those socks!"

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