She played Allie Hamilton, a wealthy southern belle who has a forbidden love affair with Gosling's poor labourer, Noah Calhoun.
Upon arrival on the photo set, Mc Adams discovered it was a nude session, declined and left.
She later parted ways with her publicist at the time, who had not informed her in advance.
"Previously she has been seen mostly as a hot chick or an idealized sweetheart", he wrote.
"Here she is feisty, vulnerable, plucky, warm, funny ...
Mc Adams played the daughter of an influential politician, who is caught in a love triangle with Wilson and Cooper's characters.