The country music star said he'd been "wrestling with this for a while."
The singer received a standing ovation for his original song about substance abuse on "America's Got Talent."
The singer addressed speculation about her political beliefs ahead of her wedding with the country music star.
The country superstar's latest release follows a record-breaking season of "The Voice" and comes exactly 20 years after his debut single.
The "34+35" singer said she is "beyond thrilled, honored, excited" to be a coach on the hit NBC show.
The couple have been dating since 2015 after meeting on the NBC series "The Voice."
"Cheers to new beginnings and unapologetically walking in your truth," he told fans in his announcement, which also marked his 25th birthday.
"I lost all my breath when they announced my name," the winner said.
On "The Ellen DeGeneres Show," the Maroon 5 frontman said he's having the "greatest time" after moving on from NBC's talent competition series.
Shelton says he'll miss trash talking the Maroon 5 singer, something he can't do with new judge and girlfriend Gwen Stefani.