Scarlett Johansson isn’t the same good-natured lass she once was. Tabloid spies say the Golden Globe-nominated beauty was a real pain to work with on the set of her latest Woody Allen hit, Vicky Cristina Barcelona.

“Scarlett isn’t the same . . . She’s turned into the biggest prima donna,” a NY Post souce squeals.

The source added that the same producers raved about working with her on “Match Point,” when “everyone said she was a sweetheart . . . now they say, ‘Scarlett’s let it get to her head.’ “