Rob Kardashian made his way to The Grove on Thursday to chat with Extra host Mario Lopez, but he showed up in a curious clothing choice -- rolled-up jeans!

Considering the Kardashian gals are known for their fashion-forward looks, it's a bit of a surprise to see their little bro in high water pants. Then again, maybe he just really wanted us to see how white his Chuck Taylors are ... and they are spiffy.

Even though he really needed fashion advice this morning, Rob got fashion tips from Mario instead. Good thing Rob is prepared to trot his socks off today! "Time to rehearse all day! Working on this foxtrot! Next week is Most Memorable Year of Your Life and got a very meaningful song! Can't wait!" he Tweeted Thursday afternoon.

Wonder what his song will be -- perhaps something dedicated to his father?