Matlin, who is also deaf, competed on season 6 of "DWTS" and showed solidarity toward DiMarco by attending the finale -- sporting a Nyle T-shirt and all.
Matlin was among the slew of celebs to witness DiMarco's winning performance to Disturbed's "The Sound of Silence" with dance partner Peta Murgatroyd.
Thanks to Matlin and her interpreter, “DWTS” judge Carrie Ann Inaba delivered her remarks to DiMarco in sign language after his final dance.
DiMarco, who was the first deaf contestant and deaf winner of "America's Next Top Model," also made history Tuesday as the first deaf winner of "DWTS" -- beating out UFC fighter Paige VanZant and “GMA” meteorologist Ginger Zee.
Following his win, Matlin tweeted congratulations to DiMarco.
"Nothing better than tears of joy," she wrote. "@NyleDiMarco you deserve nothing but 10 10 10 FOREVER! @DancingABC loves you!"