Paris Hilton blonde gym sunglasses smile

Yes, even Paris Hilton busts her booty on the treadmill!

We caught the color coordinated heiress post-workout in Hollywood yesterday afternoon, and with the notable exception of her Barbie pink nails, Paris was decked out in head to toe blue. Hey, her closet doesn't just consist of outfits that match her pink Bentley!

As her shirt says, have a nice day!