updated 02/06/2012 AT 7:30 PM ET
•originally published 02/07/2012 AT 10:20 AM ET
“He’s your dream costar,” Mendes, 37, tells Marie Claire in its March issue. “I have never felt so creatively satisfied on a film. He’s amazing.”
But that’s about as much as the notably private actress would reveal about Gosling, 31, who Mendes was first photographed holding hands with in September.