According to reports from the US, superstar Leo and his model girlfriend quietly and amicably called it quits a few months ago because of their busy work schedules.
A source told People: "They are both so busy and he's got a big movie coming out and she's one of the biggest supermodels in the world. There is no other person in the picture."
Another insider added to Us Weekly: "They both needed to take a break because of that. They are still friends and talking but it's over."
Leonardo and Kelly began dating last summer but have always tried to keep their relationship away from the cameras. Leo's notoriously coy about his private life, which has included previous relationships with Gisele Bundchen, Bar Refaeli and Blake Lively.
He can next be seen in the movie The Revenant.