Rascal Flatts will release its sixth studio album, "Unstoppable," on April 7. The group made the announcement via text message to their fans. The new album, co-produced by Dann Huff and Rascal Flatts, is the band's first studio album since 2007's multi-platinum "Still Feels Good."

Meanwhile, the group, which took favorite group honors on the Jan. 7 People's Choice Awards, announced from the stage that fans could enter a contest to create and vote on the cover art for the set. Submissions will be accepted until Jan. 22 at the People's Choice Web site, pcaVOTE.com The winning designer and image will be revealed in February.