Breanna Stewart and Jonquel Jones celebrated in style after helping the New York Liberty win their first-ever WNBA Finals on Sunday ... commemorating the accomplishment by raging with fans and the team's famous mascot, Ellie the Elephant!!
Stewart was spotted out on the town shortly after the Liberty beat the Minnesota Lynx in overtime at the Barclays Center ... taking Game 5 and the championship series in epic fashion.
Shortly after the victory, the 6-foot-4 forward danced the night away and chugged a bottle of bubbly in the middle of a crowded NYC venue .