RadarOnline.com has learned Shelton, 41, recently was schlepping groceries at Gelson's Market in Sherman Oaks, Calif., when a stampede of shrieking teenage girls came running toward him and his cart.
But the screeching gaggle skidded right past the musician without so much as a single selfie!
"The girls weren't screaming for Blake — they were die-hard fans of Meghan Markle!" laughs an eyewitness, who points out that the supermarket is home to Humphrey Yogart, the fro-yo shop where Markle, 36, worked as a teen.
"They were determined to see where the American princess once blended soft serve for tips," said the onlooker. "The teens didn't care about Blake at all!"
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