KENNY'S SECRET LIFE UNDER LOCK & KEY!

COUNTRY kingpin Kenny Chesney may let it all hang out on stage — but behind the scenes he’s a man of mystery who lives a bizarre secret life, insiders dish.

“Besides Garth Brooks and George Strait, Kenny’s the only country star who can sell out 80,000-seat stadiums, and still be an intensely tight-lipped guy who guards his privacy like the crown jewels,” says a source close to the 55-year-old She’s Got It All singer, who is now on a nationwide tour.

Chesney was once much less guarded, say sources, but that changed as a result of his blink-and-you-missed-it marriage to Oscar-winning actress Renée Zellweger in 2005.

The celebs wed on the fly after only knowing each other for five months, and when the sexy Bridget Jones star filed for an annulment, she shockingly cited “fraud” as the cause. That led to riling rumors Kenny was secretly gay.