The pair "remain friends," according to the reps.
The couple turned heads in May when they were photographed cavorting on Steven Speilberg's yach in Monte Carlo. They were later spotted in several countries together, including Italy and Australia.
DiCaprio, 36, had just ended his relationship with Israeli model Bar Rafaeli when he hooked up with Lively, 24. Bar is reportedly dating the son of French president Nicolas Sarkozy.