Hilary Duff  kept her sunglasses on to match her black bikini  as she tested out the water in Hawaii yesterday. She's on vacation with her standard tropical vacation partner , boyfriend of two years Mike Comrie. Hilary is not the only celeb who loves the ocean — check out our guess who's on the beach quiz  to see if you can tell which stars are strolling seaside.
Splash News Online 
To see more of Hilary in her bikini just .