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Singer Christina Aguilera is going solo.

Though the pop star, 29, told less than a year ago that she felt "very blessed" in her union with music executive Jordan Bratman, 33, a source close to Aguilera tells Us the couple “have been separated for a few months.”

And though Aguilera and Bratman — who met in 2002 (he was a producer on one of her albums) and wed in 2005 — have not yet decided whether to divorce, the source reveals, "they are now living apart, and they will see how that goes."

What went wrong?

“They were very much in love,” explains the insider. "But over the last six months, it ­became clear they were more like friends than husband and wife." The source adds that Aguilera even "­proposed their August trip to Italy to ­rekindle their relationship, but it didn't help."

The duo remain united in their commitment, however, to son Max, 2.

"He is their main concern," says the pal. Aguilera has even been bringing the tot to the studio while she wraps up the soundtrack for her November 24 musical, Burlesque.

"Christina is doing her best to be a great mom," says the insider. "She has a lot to ­juggle, but she's learning how to make it work and balance it all."

In a statement released late Tuesday, the singer told Us: "Although Jordan and I are separated, our commitment to our son Max remains as strong as ever"