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Chrissy Metz defends "This Is Us" co-star Chris Sullivan's 'fat suit'

Metz and Sullivan play engaged couple Kate and Toby on the hit NBC show.
/ Source: TODAY

Chrissy Metz went to the mat for her co-star Chris Sullivan, who wears a "fat suit" to play her funnyman fiancé Toby on "This Is Us."

During Thursday's "Watch What Happens Live with Andy Cohen," Metz, 36, said hiring anyone other than Sullivan, 36, would have been silly because he was "the best man for the job."

“We tested a lot of gentlemen who were bigger, and I get it — people think the authenticity is kind of ruined by that. But Chris has been heavier, so I think he understands the plight of being overweight,” the actress explained.

Metz said Sullivan was perfect for the role of Toby, even if he required a little extra padding.

RELATED: How a panic attack led 'This Is Us' star Chrissy Metz to lose 100 pounds

"People wear prosthetics all the time — it’s just weight as opposed to, like, a nose or a chin,” she said. “It’s just kind of the name of the game.”

Metz said her "This Is Us" co-star Sullivan was simply "the best man for the job."NBC

Metz herself wore prosthetic padding when she portrayed "fat lady" Ima Barbara Wiggles on "American Horror Story: Freak Show" in 2014.

Metz's character, Kate Pearson, has struggled with her weight throughout her life. Sparks fly when she meets dapper dresser Toby in a weight loss support group, and the two fall in love.

The actress, who was nominated for a Golden Globe this past December, revealed to talk show host Ellen DeGeneres that she's excited to lose weight along with her character, and signed on to the part knowing that was a possibility.

"Like most actors, we are chameleons. We play different roles. Like Christian Bale lost all that weight for 'The Machinist," Metz told DeGeneres. "So I was like, 'Oh, I hope I get to lose weight. Because that's a win-win for me."