Security at Saks Fifth Avenue in Midtown discovered a loaded gun inside the bag of a shoplifter who tried to buy a $5,600 bag and $2,800 wallet from Louis Vuitton with a store credit card belonging to somebody else, police said Tuesday.

Claudia Joseph tried to purchase the high end items Monday night with a card, which may have been a duplicate, belonging to a 67-year-old Pittsburgh man, cops said.

While store security held her for police they discovered a loaded .22-caliber Ruger in her bag, along with marijuana, police said.

Joseph, 32, of Brentwood, L.I., was charged with grand larceny and gun and pot possession.

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On May 8, she tried to pull a similar scam at Bloomingdales, allegedly using a Long Island womans credit card to make a purchase, cops said.

She was caught with cocaine and Xanax during that caper and charged with grand larceny, identity theft, marijuana possession and drug possession, officials said.