The "Transformers" star was filming scenes for Boston Marathon bombing movie "Patriots Day" in Framingham, Massachusetts when Jackie Becker, who is severely brain damaged after contracting eastern equine encephalitis as a child, showed up and offered to treat her favourite celebrity, reported Access Hollywood.
"I said to him, 'We have this beautiful pizza from our local Italian bakery, Framingham Bakery, with these anisette cookies for him," Jackie's mother Jean Becker said.
Towards the end of their meeting, Wahlberg, 44, invited the pair to the film's premiere.
"He looked to his assistant and he said, 'Give them a card, I'd like you to come to the premiere'. I said to him, 'You have no idea what you just did'. It was the best day of her (Jackie's) life..."