Aguilera began dating music marketing executive Jordan Bratman in 2002. Their engagement was announced in February 2005, and they married on November 19, 2005, in a Napa Valley estate. In an interview with Ellen DeGeneres, Aguilera revealed that she and Bratman enjoy being nude on Sundays, saying, "You have to keep marriage alive, spice it up". The story received so much attention that following the news supermodel Heidi Klum told Degeneres that she and her husband Seal would consider doing the same ritual.

In May 2006, she posed nude for a Marilyn Monroe-inspired photoshoot in GQ magazine where she re-created several photographs done by Monroe and spoke about her marriage to Bratman. In the issue she also expressed disappointment in fellow singer Mariah Carey, saying that Carey "was never cool to me", and that "one time we were at a party, I think she got really drunk, and had really derogatory things to say to me." Carey then released a statement saying, "It is sad yet predictable that she would use my name at this time to reinvent past incidents for promotional gain." Aguilera responded saying, "My intentions were not to upset Mariah with any statements published or taken out of context. I have all the respect in the world for her."

On September 9, 2007, Paris Hilton claimed that the singer was pregnant. Aguilera, however, had not yet publicly confirmed her pregnancy at the time. Aguilera later confirmed this on November 4 in an interview with Glamour magazine. On January 12, 2008, Aguilera gave birth to her son, Max Liron Bratman, at Cedars-Sinai Medical Center in Los Angeles, California. His name translates to "Our Greatest Song" in Hebrew. Aguilera was reportedly paid $1.5 million USD by People magazine for her baby pictures, which according to Forbes places fifth on the list of the most expensive celebrity baby photos.

• "Dancing with the Stars" (1 episode, 2008)
       - Episode #7.1 (2008) TV episode (performer: "Tilt Ya Head Back")
• Get Smart (2008) (performer: "Ain't No Other Man")
• "Video on Trial" (1 episode, 2008)
  ... aka V.O.T. (Canada: English title: short title)
       - Totally Beachin' Video on Trial (2008) TV episode (performer: "Genie in a Bottle")
• Shine a Light (2008) (performer: "Live With Me")
  ... aka Shine a Light: The IMAX Experience (USA: IMAX version)
• "So You Think You Can Dance" (3 episodes, 2007)
       - Season Finale: Part 2 (2007) TV episode (performer: "Ain't No Other Man")
       - Episode #3.15 (2007) TV episode (performer: "Walk Away")
       - Episode #3.7 (2007) TV episode (performer: "Ain't No Other Man")
• "Shminiya, Ha-" (2 episodes, 2006-2007)
  ... aka The Eight (International: English title)
       - Immunity (2007) TV episode (performer: "Slow Down Baby") ("Slow Down Baby")
       - Noa (2006) TV episode (performer: "Hurt") ("Hurt")
• Tony Bennett: An American Classic (2006) (TV) (performer: "Steppin' Out")
• "Saturday Night Live" (4 episodes, 2000-2006)