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Tom Felton and Rupert Grint might've played enemies in the Wizarding World, but in real life they're happy to reunite for a good cause. The former Harry Potter castmates [2] joined forces ahead of the holidays to deliver gifts to Great Ormond Street Hospital, a children's hospital in London. On Dec. 20, Tom shared pictures of the sweet experience on Instagram.

"A huge thank you to @markoflego & @noblecollectionuk for allowing Rupes & I to play Santa for the day at @greatormondst," he captioned a series of photos. Looks like they dropped off some buildable Harry Potter [3] Lego sets and even signed memorabilia. This marks a week full of reunions for Tom, who also recently spent time with Harry Potter costars [4] Emma Watson [5], Matthew Lewis, Bonnie Wright, and Evanna Lynch. Hogwarts really does bring people together!