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Gwen Stefani, Instagram

Instagram, Splash

Are Gwen Stefani and Blake Shelton taking their romance to the next level? Are they...sharing clothes?

The two The Voice coaches and singers have been dating officially for at least a month. On Wednesday, Stefani, 46, posted on her Instagram page a selfie showing her lying on what appears to be a white pillow wearing a camouflage-print baseball cap that's almost identical to a hat Shelton, 39, has often sported, which bears a logo with two shotguns and a silhouette of a moose that reads "10 Pistols Ranch." The latter star owns a property in Oklahoma called the Ten Point Ranch.

"#goodmorning gx," Stefani wrote.

The day before, she and Shelton were spotted packing on the PDA during a double date with friends in the Los Angeles area.

While the two have been photographed looking cozy several times, they have remained coy when asked about their love lives. E! News confirmed they were dating in November, months after Shelton divorced Miranda Lambert, 32, and Stefani filed papers to end her own marriage to Gavin Rossdale, 50.

A source told E! News last month Stefani and Shelton are "extremely happy" together.