The stars had a massive OTH catch-up after attending a convention in the city at the Hyatt Regency Etoile Hotel.
In a group selfie with Hilarie and Bethany Joy, Sophia - who played Brooke Davis in the drama - said: "Basically the best."
The girls looked pleased as punch to be back together! Anyone else wishing they would reunite for good?!
One Tree Hill was a popular American drama series, which aired from 2003 to 2012. Set in the fictional town of Tree Hill, North Carolina, the series initially followed two half-brothers, Lucas and Nathan Scott, who were competing for positions on their school's basketball team.
Sophia also cuddled up to James and Paul Johansson, who played Nathan and Dan Scott respectively.
"My two favourite Scotts. #PJRaven @ThisIsJamesLafferty #HomiesForLife #OTHfam," Sophia said.
It seems the only person missing from the reunion was Chad Michael Murray, who played lead character Lucas.
However, he did tweet about his absence on Saturday (18 October): "Sorry I can't make it to Paris, Milan & London guys. Heavy into shooting @AgentCarterTV I'll Try 2 make out sometime soon! Have a great time."
Sharing a final group photo, including one with Antwon Tanner (who played Skills Taylor), Paul simply said: "Wow! All together again!"
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