Alexa Campbell Brantley Gilbert is now a father of three ... "If you'd have told me I'd be topless on an album cover the year before I turned 40, I would say you were crazy," remarks Gilbert ...

Brantley Gilbert has packed ... There are also some non-country covers in the mix from Fall Out Boy and Rage Against the Machine — Gilbert even paused the show at one point to play the anthem ...

The popular artist is known for mixing country, rap and rock genres, with hits like "Bottoms Up" and "Country Must Be Country ...