From 2000 to 2005, Bündchen was in a relationship with American actor Leonardo DiCaprio. At the 2005 Academy Awards, she wore an embroidered ivory Empire-waist Christian Dior dress to the ceremony with beau and Aviator best-actor nominee Leonardo DiCaprio; of which the look earned her a nod on Vogue’s best-dressed list.
On Thursday, 26 February 2009, Bündchen married Tom Brady in a small Catholic ceremony at St. Monica Catholic Church in Santa Monica, California. On 5 April 2009, the couple remarried in a larger ceremony in Costa Rica, with Brady's son (whom he had with actress Bridget Moynahan) present. For the April ceremony, Bündchen wore a dress and veil designed by John Galliano.
In December 2009, Bündchen gave birth to a boy in Boston, named Benjamin Rein Brady—his middle name is in honor of Bündchen's mother's father Reinoldo. They baptized him at 6 months in Santa Monica on 22 June 2010.
Bündchen caused controversy when she told Harper's Bazaar Magazine that breastfeeding should be a "worldwide law", but later moderated her comments on her blog, stating, "my intention was to make a comment about the importance of breastfeeding".