Ryan Gosling reportedly "flipped out" when a photographer called his girlfriend Eva Mendes "baby."

The 'Place Beyond The Pines' co-stars were in New York when the snapper, who recently shot Eva for a fashion spread, called out the affectionate greeting. Gosling was unimpressed and allegedly almost came to blows with the photographer before Mendes calmed him down.

An eyewitness told the New York Post: "Ryan completely flipped out, and it got heated.

"Ryan got in the guy's face and said, 'Who are you calling baby?' Eva had to jump in and calm everyone down before it came to fisticuffs. Ryan then made nice and shook the guy's hand."

Gosling and Mendes have been in a relationship since September 2011. The actress recently admitted it was "adorable" seeing how her real-life partner embraced fatherhood on the set of their new movie 'The Place Beyond The Pines'.

"He's really good," she said. "He loves babies and he loved playing with the little boy we used in the film to play our son. It was adorable to see him in that light."