Former co-stars and colleagues of Betty White are paying tribute after the "Golden Girls" actress died at the age of 99.

White's death, confirmed Friday, came less than three weeks before she would've turned 100 on Jan. 17.

White, best known for her television roles as Sue Ann Nivens on "The Mary Tyler Moore Show" and Rose Nylund on "The Golden Girls," endeared herself to audiences for decades.

She was also a beloved figure in Hollywood through the course of her career that spanned 75 years.

PHOTO: Actress Betty White poses for a portrait in Los Angeles, May 26, 2010.
Gus Ruelas/Reuters
Actress Betty White poses for a portrait in Los Angeles, May 26, 2010.

In 2013, the Guinness Book of World Records awarded White, a six-time Emmy winner, with having the longest television career for a female entertainer.

On Friday, as news of her death was confirmed, White's Hollywood castmates celebrated her life and legacy.

Ryan Reynolds, who co-starred in the 2009 romantic comedy "The Proposal" with White, took to Twitter to pay tribute, writing, "The world looks different now."

"She was great at defying expectation. She managed to grow very old and somehow, not old enough," he wrote. "We’ll miss you, Betty. Now you know the secret."

Ellen DeGeneres, who was part of White's televised 90th birthday special in 2012, wrote on Twitter, "What an exceptional life. I’m grateful for every second I got to spend with Betty White. Sending love to her family, friends and all of us."

"Saved By the Bell" star and TV host Mario Lopez shared a photo on Twitter of himself hugging White, writing, "What an incredible life."

The tributes also came in from White's fellow TV sitcom stars, including Debra Messing and Henry Winkler.

Former "Saturday Night Live" star Seth Meyers shared a behind the scenes memory from White's hosting gig in 2010, writing, "RIP Betty White, the only SNL host I ever saw get a standing ovation at the after party. A party at which she ordered a vodka and a hotdog and stayed til the bitter end."

White was also remembered by the U.S. Army for her service as a member of the American Women's Voluntary Services during World War II.

Other tributes came from some of Hollywood's biggest stars, who thanked White for making them laugh for so many years.

White was inducted into the Television Academy Hall of Fame in 1995 and also has a star on the Hollywood Walk of Fame. Memorial flowers were set to be placed on the star Friday as a tribute.