All three members of country supergroup Lady Antebellum are officially off the market, as Dave Haywood married Kelli Cashiola on a private farm just outside Nashville on Saturday. The bride, 30, wore a white lace dress and a white flower in her hair, while singer/songwriter Dave Barnes provided the music for the happy occasion, according to People. Several wedding guests took to Twitter to offer congratulations to the newlyweds. "The Dave Haywood/Kelli Cashiola wedding was awesome. Like a movie," fellow Nashville country trio Mockingbird Sun Tweeted on Sunday. "Wish them the very best!" Attendee Kyle Key Tweeted, "Back from secret wedding location. What a wedding! The whole thing was straight out of a movie. Congrats Dave and Kelli!" Dave, 29, and Kelli, a vice president at Warner Music Nashville , announced their engagement in December. The couple had only been dating for seven months prior to their engagement, but had been friends...