Lady Antebellum has blown away all sales expectations with their sophomore album, Need You Now. The collection sold more than 480 thousand copies in its first week, and comes in at number one on Billboard's Top 200 Albums chart. It's the biggest debut week since Susan Boyle moved more than 700 thousand copies of I Dreamed a Dream back in November. Need You Now also posted the best opening week for a country album since Taylor Swift's Fearless hit stores in November 2008. "We are absolutely stunned," says Lady Antebellum's Dave Haywood. "To be getting such awesome feedback from everyone who bought the record is so validating."

These huge sales numbers come along as the song "Need You Now" is gaining tons of airplay at pop radio next to tunes by Lady GaGa and Beyonce. "I think what we want is our music to be heard by as many people as possible," says Lady A's Hillary Scott, "so if that's the avenue, then great."

The band has no intention of leaving country music, though. Like Keith Urban, Taylor Swift and Shania Twain before them, they're hoping to bring new fans into country music. "We're not going anywhere," says band member Charles Kelley. "We'll never leave this genre." Lady Antebellum takes their act on the road with Tim McGraw's Southern Voice tour starting next week.