Typically when a celebrity dons a fat suit we expect them to look like Monica from Friends or Gwyneth Paltrow in Shallow Hal. You know, comical. But every so often the transformation is believable enough that fans can’t even tell! From This Is UsChris Sullivan to Harry Potter‘s Matthew Lewis (Neville Longbottom wasn’t overweight in real life??), these stars wore extra padding in their costumes without anyone noticing.

Since Chrissy Metz and her co-star’s size is a main plot line on the show, fans were outraged when they realized that only one of the stars even struggled with their weight in real life. However, Chrissy was quick to come to Chris’ defense, saying that he was the best guy for the role by a long shot.

chris sullivan getty images

“We tested a lot of gentlemen who were bigger, and I get it — people think the authenticity is kind of ruined by that,” she has said. “But Chris has been heavier, so I think he understands the plight of being overweight. People wear prosthetics all the time — it’s just weight as opposed to, like, a nose or a chin. It’s just kind of the name of the game.”

Click through the gallery to see other celebs you had no idea wore fat suits.