Viewers have loved Ant McPartlin and Declan Donnelly's DNA Journey on ITV.
But there was one final mega-twist to the tale.
In last night's concluding episode (11.11.19), Ant, 43, and Dec, 44, stunned viewers by finding out that they're related.
The long-term friends found out that they were long-lost cousins by sharing the same DNA with a link on their dads' side that goes as way, way, WAY back.
Experts found the same DNA marker - S660 - in both the duo and a recently excavated a Viking warrior who died in 790AD.
When they found out the news Ant said: "That’s brilliant. That’s amazing. That’s remarkable."
Dec, meanwhile, said: "Oh my God."
"That wasn't, 'Oh my God that’s terrible news', that was, 'Oh my God that's a big surprise'."
After the first episode, fans of the Britain's Got Talent and I'm A Celeb hosts were convinced that the pair would end up finding out they were related to each other.
By the end of the episode, fans were certain that episode two would reveal a surprise.
That’s brilliant. That’s amazing. That’s remarkable.
"Let's be honest," one Twitter user said. "All we want to know is if Ant and Dec are related."
And it wasn't long after the news broke that viewers took to the social media site to express their shock and delight.
One user wrote that she was "so happy right now" and used a GIF that read 'the best Christmas present ever' to express her feelings.
Ant and Dec, meanwhile, issued this tweet:
"Now where's my cousin," Ant joked. "I need sun cream on my back. Declan!!!!"