First Keri Russell ran off with Matthew Rhys’ heart, and now she loots his wardrobe.

“That’s our thing,” the actress told The Post at the Rag & Bone show during New York Fashion Week 2020, which she attended with her main squeeze and “The Americans” co-star. “I buy him clothes and then I steal them and wear them.”

Rhys, in turn, sometimes appropriates hers. “I’ll kind of buy something [for her] and go, oh s–t, that didn’t fit! But it fits me, bingo!” he shouted.

“I’m not a shopper,” he added. “That’s the one thing I don’t do well, and I don’t really adhere to.”

“You like an internet search, though,” pointed out Russell, who said that Rhys chose her outfit for the show.

“Yes, but for kind of weird, interesting things, and usually recycled things,” he said. “I try to buy things that have had a life before.”

Is he worried about bedbugs?

“I’ve stopped buying secondhand mattresses and bedding,” he joked.