The singer, 29, who filed for divorce from husband Jordan Bratman, 33, last month, says the one piece of advice that stuck with her was when Cher told her, "You know, honey, husbands come and go, but I am still Cher at the end of the day."
"We were like old chatty girlfriends that could not stop talking," Aguilera says. "They had to drag us to set a few times because we were late just talking about love and relationships and life."
While Aguilera has been quietly seeing Matthew D. Rutler, a set assistant from the movie, Aguilera says the main man in her life is her son Max, who'll be 3 in January.
And although she wrote a song for Max on her Bionic album, she says his favorite song is actually a tune on the Burlesque soundtrack called "Beautiful People." "He loves that song. He was in the studio while I was recording it and was like, 'Put on 'Beautiful People.' "
The singer admits balancing motherhood and her career isn't easy but hopes her work ethic sets an example for her son.
"One day he will be able to look back at my body of work and feel proud of it. Hopefully it will motivate him to be an individual himself and really go for what he wants out of life."
Will that include a singing career? "He is musically inclined, I can tell," says Aguilera. "He is so smart and such a character I could see him doing something in the entertainment business."