Blake Plays Mr. Nice Guy To Gwen’s Three Kids … And Miranda’s Seething!

Country star Miranda Lambert is furious at ex-husband Blake Shelton — who never wanted to have children during their 10 years together — now that he’s suddenly playing daddy to new girlfriend Gwen Stefani’s three children!

A rep for singing star Gwen, 46, confirmed she is dating 39-year-old fellow “Voice” coach Blake, coming on the heels of their respective marriage breakups.

Blake and Miranda, 32, divorced in July, and Gwen split with rocker husband Gavin Rossdale a month later.

Gwen’s 13-year marriage to Gavin produced three sons — Kingston, 9, Zuma, 7, and Apollo, 20 months.

Miranda is “deeply hurt and angry” by the new romance, since she “couldn’t get Blake off square one” in starting a family during a relationship that began in 2005, a pal told The National ENQUIRER.

“Now, Blake is stepping into a ready-made family with Gwen,” the friend said. “Miranda feels like she wasted the best years of her life with this guy, who kept on putting off the idea of having children, but now can’t seem to get enough of this woman with a house full of kids.”

Blake and Gwen met in June 2014 and, the pal added, “Even back then, Miranda suspected Blake had a thing for Gwen and can’t help thinking she’s the reason their marriage ended — that Blake wanted to feel free to pursue her.”

Adding insult to injury for Miranda, the announcement that Blake and Gwen were dating came just hours before Miranda took the stage in Nashville Nov. 4 to perform and to receive Female Vocalist of the Year at the CMA Awards.

“Miranda felt blind-sided,” the friend said. “Here it was, one of the biggest nights of her life, and people were coming up to her offering sympathy, not congratulations. “Blake really pulled the rug out from under her.”

Another source said Blake “definitely sees a future” with Gwen.

“In Blake’s mind, this isn’t a fling,” the friend said. “He’s put Miranda in the rear view mirror and is really excited about making a life with Gwen. And he believes he’s older and wiser now, and can be a good stepdad to Gwen’s boys as their relationship progresses.”

Comments