By Rose Walano
Updated Apr 26, 2012 @ 5:00 pm
Rachel Bilson, Hayden Panettiere
Credit: FameFlynet Pictures; EUBANK/SHAW/LABORE/

Summer's just around the corner, and celebrities know it! Rachel Bilson was spotted splashing around in the Barbadian waves wearing a black and silver two-piece, and Hayden Panettiere worked on her backhand in a brown string bikini while on vacation in Hawaii. Click through to see more of our favorite celebrity bikinis of 2012—so far!