Blake Shelton Isn't Fazed by Miranda Lambert's Marriage: 'He Put Her in His Rear View Mirror'

Blake Shelton isn’t giving his ex-wife Miranda Lambert’s new marriage any attention.

According to a source close to the country star, the singer has fully moved on with his life after the couple filed for divorce more than three years ago.

“He put Miranda in his rear view mirror long ago. Miranda brings nothing positive to his life,” says the source. “Their marriage ended and he moved on. Ever since, he is grateful every day.”

Shelton, 42, instead is focusing on his own happiness — including life with longtime girlfriend Gwen Stefani, 49. “Blake is crazy about Gwen, and all he sees are hearts in his eyes every day,” says the source.

RELATED: Miranda Lambert & New Husband Brendan McLoughlin First Met on This Big Day in November: Source

After six years of dating and four years of marriage, Shelton and Lambert, 35, filed for divorce and announced their breakup in a joint statement. “This is not the future we envisioned. And it is with heavy hearts that we move forward separately,” they said at the time.

RELATED: Miranda Lambert Wears Elegant Long-Sleeve Lace Dress to Marry Brendan McLoughlin

The “Tin Man” singer revealed her new marriage on Saturday, telling fans via Instagram she had found “the love of my life.”

“My heart is full. Thank you Brendan McLoughlin for loving me for…. me,” she wrote, adding a red heart emoji and the hashtag “theone.”

The couple were married Jan. 26, a source confirmed to PEOPLE.

Just hours before sharing her secret with the world, Lambert — who split from Evan Felker last summer — and McLoughlin, 27, were also spotted out in New York City’s SoHo district, smiling as they walked and held hands outside with their wedding bands on full display.