"I'm sad to hear of her passing," Sweetin shared after her performance on Dancing With the Stars. Roberts played Claire Tanner, grandmother to Sweetin's character, Stephanie Tanner, in a season three episode of Full House in 1989.
"She will always be a piece of Full House history," said the 34-year-old actress, who was only 7 when Roberts guest-starred on the show. "We always think that everyone in this business sort of lives on eternally, that they're always there, and when we lose them it's really sad."
Facts of Life star and fellow DWTS contestant Kim Fields also shared some kind words about Roberts, praising her for being a wonderful person and a great actress.
"Doris and I, our paths crossed very briefly but wonderfully," Fields, 46, told ET. "I just loved her. I'm just so grateful for all her amazing performances. Not just on Everybody Loves Raymond, but on Remington Steele [and in] her movies."
"I'm grateful for her gifts that she gave," she added. "She was just a wonderful example of not only a consummate professional but a diverse actress."
The five-time Emmy winner died on Sunday in Los Angeles, California at the age of 90. Many of Roberts’ Everybody Loves Raymond co-stars, including Ray Romano, Patricia Heaton and Brad Garrett -- as well as the show's creator, Phil Rosenthal -- honored the celebrated performer with emotional memorials.