In a statement announcing their separation on Tuesday, Aguilera said the pair's commitment to their son "remains as strong as ever."
/*Aguilera*/ cites irreconcilable differences for the breakup.
The couple has one son and they are seeking joint custody.
The entertainer's 1999 debut album, "Christina Aguilera," was a commercial success and included such hit singles as "Genie in a Bottle." But her latest CD, "Bionic," generated poor sales when released earlier this year.
The Associated Press contributed to this report.