The cast, which also included Antwon Tanner and Paul Johansson, met up in Montreal for drinks, and took to Instagram to post pictures of the party, reported Entertainment Weekly.
"Peanuts (and one sleeping beauty) #longday #greatday #fam #likeitwasyesterday #pickuprightwhereweleaveoff #hitmewithyourbestshot #purplereign," wrote Bush, who played Brooke Davis on the series.
Zunig, 52, who is known for playing Victoria Davis on the show, shared a picture with Bush and wrote, "Reunited. 5 years of playing this woman's mom. A little red wine and catching up w @sophiabush #iloveher #onetreehill #fwtm."
Bush, however, said she tried to FaceTime Burton but it could not happen.
"One Tree Hill", which ran for nine seasons, concluded on April 4, 2012.
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