Kevin, 36, and his dance partner Stacey Dooley, 31, took home the Glitterball trophy at the weekend – beating Joe Sugg, Faye Tozer, Ashley Roberts and their respective partners.
And Joanne, 35, couldn't be prouder of her older sibling.
She wrote on Instagram: "WE DID IT MUM AND DAD! @keviclifton ….. Thankyou @sjdooley and @oreodubaofficial #strictlychampions #brothersister #strictly @bbcstrictly".
Joanne, who left the show last year, won Strictly back in 2016 when she was partnered with Ore Oduba.
Kevin had been in the final four times before, but took home the prize for the first time alongside Stacey on Saturday.
Stacey paid tribute to her partner after winning as he broke down in tears.
She said: "I should say something quite poignant, shouldn't I?
"You know how highly I think of you. I think you are the biggest gem.
"It's no surprise you have been in the final as many times as you have. It's daunting doing something you haven't done before.
"But he's so patient and he walks you through. You so deserve this. You so deserve this."
The professional dancer replied: "Thank you so much, not just for being so amazing and for dancing so well, but for being the most wonderful person to work with, to spend every day training with.
"You've worked so hard.
"You are so lovely and I think the absolute world of you."
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