US Weekly reports that Britney Spears went insane at a porn shop when she was told she wasn’t allowed to try on underwear.

Spears loaded up on naughty skivvies and headed to the fitting rooms. But store employees “told her they don’t allow people to try on underwear,” a source at the scene says. “She was really upset.” Adds the source: “She looked out of it. There was nothing going on behind her eyes.” At that point, Spears threw a fit, and took off her own underwear before trying on a pair of boyshorts (with “Barely Legal’ stitched across the rear end) in the middle of the store while 15 other customers looked on. An eyewitness tells Us, “The employees kept saying ‘Don’t change out here!’ She’s just like, ‘Well, I couldn’t take them in the fitting room!’ It was like dealing with a child.” Spears’ tantrum only continued. “The staff told her she had to pay, and she rolled her eyes, but paid with a credit card,” the source tells Us. As payback, “on her way out, she went up to a mannequin, snatched the wig off the head, and stole it!”

OK there’s too much going on here. Britney buying underwear? Ones she will never wear. And she strips in front of people for no reason at all? That’s unheard of. But that’s a lesson for you, girls. When you can’t get what you want, take off your pants and steal something. The Starbucks barista gave you a tall mocha frap instead of venti? Throw a tantrum and drop your pants. That’ll show ‘em.

Here’s Britney in her backyard, wearing her own underwear/bikini, apparently putting up a free show: