Melissa McCarthy gets photoshoped in 'The Heat' poster?

Melissa McCarthy looks slimmer on the poster of her latest movie 'The Heat' with Sandra Bullock, prompting bloggers to speculate that her face was airbrushed.
A UK promotional image of the actress and co-star Sandra Bullock has many speculating whether Photoshop was used to make McCarthy's face appear slimmer.
Buzzfeed coyly remarked that McCarthy "looks... different" in the UK poster, then proceeded to compare actual images to those purportedly altered.
Jezebel commented that McCarthy's "face and neck appear to have gotten some copious 'Shopping treatment on the UK poster for The Heat."
British entertainment blog The Shiznit created a rollover image of the poster, showcasing the difference between McCarthy's poster face and what they believe her actual, undoctored face would look like on the same shot.

"Are they trying to pretend it's not her?" the blogger muses.
"Surely the whole point of The Heat's dynamic in the first place is that Sandra Bullock's character is skinny and prissy and uptight and Melissa McCarthy's character is bigger and bolshier and her diametric opposite? I'm flabbergasted at this flabby-blasting.