Blair, who met Gellar when they both starred in the cult classic 1999 film \"Cruel Intentions,\" responded to her longtime pal's post in the comments section, writing, \"I have been so fortunate to be loved by you.\"

\"And now I have had the extreme elation and grace of dancing on a ballroom floor, and being lifted and carried by my loves. And the public. It is a gift I will cherish forever,\" she continued. \"Thank you for being by my side on another journey. Here’s to many more.\"

Blair announced during the Oct. 17 episode of \"DWTS\" that she had to \"pull back\" after several MRIs indicated to her doctors that she couldn't continue in the competition. Blair has been battling multiple sclerosis since 2018.

\"My body is definitely taking a hit,\" the \"Legally Blonde\" star added. \"It's way too much for the safety of my bones. I could do extensive damage.\"

In her final performance Monday night, Blair danced a waltz to \"What the World Needs Now Is Love\" and earned a perfect -- and symbolic -- 40 out of 40 for her last spin around the ballroom.

After the episode, Blair said she was \"so lucky\" to have had the experience and \"so sad\" to leave the show.

\"Dancing with the Stars\" season 31 streams live on Mondays at 8 p.m. ET. on Disney+.

Disney is the parent company of ABC News and \"Good Morning America.\"

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