Rihanna and Justin Timberlake are going shopping — for Manhattan locations for pop-up stores for their clothing brands, The Post has learned.

Timberlake is likely shopping for space for his 13-year-old line of jeans and casual duds, William Rast. But Sequential Brands Group, which owns the brand, declined to comment.

The “SexyBack” singer is planning to open the store in Soho during New York Fashion Week — and may be considering a new bricks-and-mortar strategy, sources said.

Another Rast store will open in Los Angeles, according to a source with knowledge of the plans.

The move by Timberlake’s brand and Rihanna, with her Fenty offerings, is being followed by other bold-faced names hoping to hawk their brands in temporary stores, according to Faith Hope Consolo, Douglas Elliman Real Estate’s chairman.

Others on the hunt for space include Drew Barrymore, Kanye West, Lil Yachty and Pharrell Williams, according to Consolo.

“They are looking for storefronts during NYFW, but they might also test a neighborhood to see if it works for a long-term lease,” Consolo told The Post.

William Rast has previously held its own runway shows, but Timberlake has not shined his star power on the brand of late.

In 2016, Rast inked deals with a half-dozen stores — including Macy’s, Bloomingdale’s and Nordstrom. But the latter two no longer sell the brand.