In 2001, Julia Roberts won best actress for her role in "Erin Brockovich" and included her then-boyfriend Benjamin Bratt in her speech. The pair broke up a few months later.
Gwyneth Paltrow thanked Ben Affleck, referring to him as her "friend" during her 1999 acceptance speech for best actress in "Shakespeare in Love," but ended it with the actor later that summer.
In 2009, when Sean Penn won the best actor trophy for "Milk," he thanked everyone from the director to the screenwriter, but he failed to mention his wife, actress Robin Wright Penn, sitting in the audience. Seven months later, the on-again-off-again couple announced by press release that they were legally separating after 11 years of marriage.
ABC News' Luchina Fisher contributed to this report.