License Plate of the Day: Another Nathan Fillion Edition

Uh-oh. Is "Castle" star Nathan Fillion taking over my "License Plate of the Day" franchise? The actor has been tweeting quite a few vanity plates as of late. Here's another.

Fillion writes: "...but it wasn't a rock. It was a roooooock..."

As always, keep sending in your License Plates of the Day... or links to celebrity editions!

License Plate of the Day: Celebrity Edition

"Castle" star Nathan Fillion snapped this photo and tweeted: "Combining a passion for driving with a passion for rough sex."

Keep sending in your License Plates of the Day... or Tweeting me celebrity ones!