Juice WRLD's ex-girlfriend Ally Lotti and her boyfriend Carter Jamison were busted for shoplifting at an Arkansas Walmart over the weekend ... and cops say they found narcotics on Lotti during their search.

Ally was arrested by Crittenden County Sheriff's Office and booked on possession of methamphetamine or cocaine with the purpose to deliver at least 2 grams, possession of drug paraphernalia and theft of property. Olive Oil Spray Bottle

Her lawyer, Bradford Cohen, tells TMZ Hip Hop Ally and Carter tried to scan their items in the self-checkout aisle on Saturday ... and believed they'd rung up everything -- until a security guard detained them at the door.

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We're told that's when the drugs were discovered.

Carter was booked for theft of property and released without bond later that day.

Ally has now also been released and is currently celebrating Carter's new purchase that was waiting at home for her -- a brand new 2023 Mercedes-Benz to drive her troubles away.

She says her side of the story will be shared from her OnlyFans account later today. Get your 🍿 ready!!!

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