Kate Walsh: Bikini Beach Day in Miami!

Kate Walsh rocks a little black bikini while taking a dip in the ocean on Thursday (December 13) in Miami Beach, Fla.

The 45-year-old Private Practice star later covered up from the sun with her beach towel while relaxing with a group of friends.

PHOTOS: Check out the latest pics of Kate Walsh

The day before, Kate took a day trip to Key West before enjoying a stroll along the water with a guy pal back in Miami.

35+ pictures of Kate Walsh enjoying the beach…