Kirsten Dunst’s red-hot romance with her “On the Road” co-star Garrett Hedlund has hit a dead-end!

After nearly two years together, hunky Garrett, 28, suddenly told the “Spider-Man” cutie, 31, that he has “no interest in marriage or babies,” revealed an insider.

“Kirsten is putting on a brave front, but she’s absolutely devastated,” the source told The ENQUIRER.

“The sad part is that she’s desperate to be a mom, and up until recently Garrett was on the same page.

“BUT GARRETT WANTS TO GROW UP a little bit first. He’s told Kirsten point-blank that he’s not even sure if she’s the girl that he wants to spend the rest of his life with.

“Now, she feels like an idiot because she was telling anyone who’d listen that they were getting engaged and ready to start a family. She’s head over heels in love with Garrett, and this has totally blindsided her.”

It’s a dramatic turn, seeing how engagement rumors have long swirled around the couple. Reports first claimed that Garrett proposed on Kirsten’s 30th birthday in April 2012. And another round of rumors had the “Country Strong” heartthrob popping the question on New Year’s Eve.

“After Kirsten’s 30th birthday, her mom Inez started telling her friends that a wedding was ‘imminent,’ ” said the source.

“For the better part of a year, her conversations with Kirsten were all about Garrett being a husband and a dad, her wedding dress and their honeymoon.”

But Garrett never proposed, and now pals are telling Kirsten – who seriously dated “Brokeback Mountain” star Jake Gyllenhaal – to dump him, said the source.

Despite that, “Kirsten is still hoping it’s just a case of cold feet,” said the source. “But her friends are screaming at her to move on. No one thinks they’ll get through this.”