Betty White through the years

Actress Betty White accepts the Daytime Emmy lifetime achievement award onstage during The 42nd Annual Daytime Emmy Awards at Warner Bros. Studios on April 26, 2015 in Burbank, Calif.

Actress Betty White during the celebration of her 93rd birthday on the set of "Hot in Cleveland" held at CBS Studios - Radford in Studio City, Calif., on Jan. 16, 2015.

Talk show host Ellen DeGeneres, left, and actress Betty White onstage at The 41st Annual People's Choice Awards at Nokia Theatre LA Live in Los Angeles, Calif., on Jan. 7, 2015.

Actress Betty White attends the The 41st Annual People's Choice Awards at Nokia Theatre LA Live in Los Angeles on Jan. 7, 2015.

BONES: L-R: Emily Deschanel and guest star Betty White in the "The Carpals in the Coy-Wolves" episode of BONES airing Thursday, Oct. 22, 2015 (8:00-9:00 PM ET/PT) on FOX. Thu-- ETPICKS22 bones (fox, 10/22 episode) for Eileen fredes ltc

Betty White, “Real Housewives of Beverly Hills” star Lisa Vanderpump and Anderson Cooper at CBS Studios during a taping of Cooper's show in Manhattan on Jan. 8, 2013.

Tim Conway guest stars on an episode of “Hot in Cleveland” with Betty White.

Carol Burnett guest stars on an episode of "Hot in Cleveland" with Betty White.

Betty White and Valerie Bertinelli in an episode of their sitcom "Hot in Cleveland."

22. "THE MARY TYLER MOORE SHOW"
The best sitcom in TV history, after "Seinfeld" and an influence so vast and sprawling as to be impossible to quantify.

Sandra Bullock and Betty White are shown in a scene from Touchstone Pictures' "The Proposal."

Betty White as herself in an episode of NBC's "30 ROCK" on Oct. 29, 2009.

Betty White, Emmy-award winner and TV legend, has been a tremendous supporter of Morris Animal Foundation for more than 40 years.

Jason Lee as Earl and Betty White as Mrs. Weezmer in an episode of "My Name is Earl."

Legendary comedic actress Betty White and Susie Essman are the celebrity contestants set to play on CBS' "Million Dollar Password" on Thursday, June 12, 2008.

Actress Betty White signs aprons to be auctioned at a charity event in the green room at the Actors and Others for Animals Roast of Betty White at the Universal Hilton in Universal City on March 12, 2005.

Betty White and Rue McClanahan practice a tap dancing routine for an episode of "The Golden Girls."

Marie Osmond stars as a divorced mom whose live-in mother, played by Betty White, and daughter, played by Ashley Johnson, try to convince her to give love another chance in "Maybe This Time."

Dean Martin, Milton Berle, Abe Vigoda and Betty White appear on NBC's "Dean Martin Celebrity Roast."