Miranda Lambert "doesn't care" who her ex-husband, Blake Shelton, is dating, a source tell Us Weekly. Credit: Jon Kopaloff/FilmMagic

Free rein. Miranda Lambert may have subtly referenced her headline-making split from Blake Shelton during her acceptance speech at the 2015 CMAs on Wednesday, Nov. 4, but the singer isn’t holding onto the past — or dwelling on Shelton’s new romance with Gwen Stefani.

“She had her suspicions but didn’t really know it was a real thing until the announcement last night,” a source tells Us of Lambert. “But she doesn’t care. She’s divorced and he can date who he wants.”

Accepting the award for Female Vocalist of the Year, the “Little Red Wagon” songstress, 31, thanked her fans, telling them that she “needed a bright spot this year.” Us Weekly exclusively confirmed just hours earlier that her ex-husband is currently romancing his fellow Voice coach.

“She got divorced from him so he’s free to date whoever he wants. She's fine,” the source says, adding that the country superstar “had an amazing night.”

As previously reported, a rep for Stefani, 46, confirmed to Us just hours before the awards show that the “Hollaback Girl” singer and Shelton, 39, were longtime friends who had only “very recently started dating.”

Rumors linking the pair swirled after they were spotted together over Halloween weekend, but neither had confirmed or denied a romance.

Lambert and Shelton shocked fans in July when they announced their decision to split after four years of marriage, but have been thus far navigating the aftermath with humor.

On Wednesday night, CMA co-host Brad Paisley offered a jab at the pair’s divorce in the opening monologue, referencing a heartbreaking split as the cameras panned to Kermit and Miss Piggy.

“On an unrelated note, howdy, Blake!” Paisley ribbed.

Shelton took to Twitter on Thursday to yuck it up with his buddy, who thanked him for being a good sport.

“Ha!! Don’t worry brother man,” he wrote. “If there’s anybody on earth who’s learned to take it its me!!! Love you buddy.”

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