The photo, posted to Instagram account KPOW!, appears to be a selfie Paltrow has taken from set, although the actor hasn't posted it to any of her official social media.
It shows Paltrow in a customised purple version of the Iron Man suit. In the comics, Potts would occasionally don one of Tony Stark's suits under the alter ego of Rescue, although it featured a red-and-silver colour scheme.
The character first appeared in Iron Man (2008) and has been a part of the Marvel Cinematic Universe ever since, Although Potts notably put on Stark's armour to save the day in Iron Man 3, she's yet to be given her own superhero identity.
An official synopsis for the film reads: "A culmination of 22 interconnected films the fourth instalment of the Avengers saga will draw audiences to witness the turning point of this epic journey. Our beloved heroes will truly understand how fragile this reality is and the sacrifices that must be made to uphold it.”
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