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16 December 2018, 18:46 | Updated: 16 December 2018, 18:51
After months of rumours, the dance partners finally confirmed they were dating in a sweet Instagram post.
Joe wrote: "I may not have won the glitter ball, but I’ve won something a million times more special."
In the photo, Joe and Dianne look adoringly into each others' eyes, while dressed up at his London flat.
Dianne had previously shared an emotional post dedicated to Joe, calling him a "dream partner" and writing: "You won in my eyes and I’m forever proud!"
Australian Dianne started the series dating Emmerdale actor Anthony Quinlan, but they confirmed their split several weeks later.
Strictly Come Dancing 2018 was won by documentary maker Stacey Dooley and her partner Kevin Clifton.