Amanda, meanwhile, donned a white shirt, beige chinos and some black combat boots.
Her signature golden tresses were covered with a short chestnut wig as she pulled an animated face in another snap.
Looking good: The actor, 35,shared hilarious behind the scenes snaps with the Mamma Mia star, 35, as he posed in the dress
Alluding to the movie's scary elements, James fixed the camera with a stare as he sported bloodshot eyes and an unhappy expression.
In another snap, he posed on a boat with co-star F. Murray Abraham as the pair appeared to be in good spirits while filming.