American Girl is getting new digs.

Mattel’s 30-year-old doll brand, which has been sold exclusively in 20 American Girl stores and on its Web site, is headed to Toys ’R’ Us shelves on Sunday.

Starting next month, the retailer will feature American Girl shops within 97 of its stores.

It marks the first time American Girl will be sold in brick-and-mortar locations outside its own stores and comes on the heels of a steep decline in sales of the pricey dolls, which cost $100-plus.

Sales plunged 19 percent in the latest quarter ended June — worse than the 8 percent drop in 2015.

“We’ve diagnosed the problem [at American Girl],” Mattel President Richard Dickson said during the June earnings call.

The shops-in-shops will feature American Girl’s newest line, WellieWishers — less expensive dolls aimed at girls ages 5 to 7 — and an exclusive selection of its Truly Me 18-inch dolls.

Mattel shares fell 1.3 percent, to close at $33.13, on Wednesday.