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A photo posted by RPP (@rppofficial) on

It's another PDA alert for Blake Shelton & Gwen Stefani!

The 39-year-old country star and his fellow singer and The Voice co-star, 46, who have been dating since at least November, were spotted cuddled up next to each other while sitting at a booth at a branch of O'Charley's restaurant and bar in Nashville on Friday night. Instagram user @rppofficial posted a photo of the two.

They were alone and "all over each other," a source told E! News exclusively.

"They were there over an hour," the source said. "No one bothered them. They sat in the back corner by the bar."

Several other customers tweeted their excitement about the couple's surprise appearance.

Shelton and Stefani had also flown to Nashville just before Christmas, to attend a private engagement party for singer RaeLynn

They have traveled together over the past month, visiting his family and shopping in his home state of Oklahoma, watching an NFL game in Arizona, going on a wine-tasting tour in Santa Barbara, California and frequenting two of her favorite restaurants, with her parents and brother, in her hometown of Anaheim, near Disneyland. 

Shelton and Stefani have also often been spotted packing on the PDA, even before it was confirmed they are dating. The two have also been exchanging cute tweets recently.

—Additional reporting by Holly Passalaqua