Alison Sweeney (born Alison Ann Sweeney; September 19, 1976) is an American dramatic actress and reality show host. Sweeney is best known for her portrayal of Samantha "Sami" Brady Hernandez on NBC's long running Days of our Lives, a role she has played under contract with the show since January 6, 1993. In this role, she has earned four Soap Opera Digest Awards and a Fan Voted Daytime Emmy Award. In 2007, she became the host of The Biggest Loser.
Her television debut was at age five in a Kodak advertisement. A few years later, she was in an episode of Tales from the Darkside. The episode, titled I Can't Help Saying Goodbye, first aired on October 5, 1986. She played the part of a young girl named Karen who could sense when others were going to die shortly before their deaths. In 1988 she appeared on the short-lived ABC sitcom Family Man.
On January 22, 1993, Sweeney first appeared in the role of Samantha "Sami" Gene Brady in the NBC soap opera Days of Our Lives—a show of which she was a fan.
In the 1990s, Sweeney struggled with her weight. She eventually was a dress size 12, not obese by medical standards, but still larger than her television peers. She documented all the tabloid talk and personal anguish in her 2004 memoir, All The Days of My Life (So Far).
In 2002, she appeared on a celebrity episode of the NBC reality game show Fear Factor. She has appeared in other NBC shows such as Friends and Las Vegas. In 2007, she joined the Jerry Lewis MDA Telethon as a co-host for the live television broadcast. She returned to her co-hosting duties for the 2008, 2009, and 2010 telethons.
In 2007, Sweeney took over hosting duties on The Biggest Loser, replacing Caroline Rhea since the fourth season. She was surprised but happy to be offered the role, where she is able to cheer on contestants and share their victories.