Nashville star Hayden Panettiere is using her off time wisely! The actress shared a twitpic of her and a friend enjoying the sun and surf in their teeny bikinis. Hayden captioned the pic on May 26, 2013, writing: "My girl! @erinmccarley." If Erin McCarley looks familiar, it's because she's a singer/songwriter that did make a cameo this season on Nashville.