No ‘SWEET CHARITY” for SHIRLEY MACLAINE as top docs channel preternatural star’s chart from svelte to bilious blubber.

During her remarkable six-decade career, showbiz legend Shirley MacLaine has always taken the time to stay in shape – but now sources tell The ENQUIRER they fear she’s losing her anti-aging battle as she packs on the pounds.

The 80-year-old star recently arrived at Los Angeles International Airport dressed in super-casual clothes that couldn’t hide her dangerous weight gain. For years, the 5-foot-7 actress tipped the scales at about 120 pounds, but observers say she now appears to have soared to 170.

“She appears to be obese,” Dr. Gabe Mirkin, an Orlando-based physician who hasn’t treated Shirley, tells The ENQUIRER.

“All obese people eventually develop high blood sugar levels after eating and therefore suffer from pre-diabetes.

“The heavier you are, the more likely you are to die of cancer and heart attacks.”

After a career that has spanned more than 50 films and several books, Shirley is now filming “Wild Oats” in Spain.

The star has apparently tried to shave years off her looks with cosmetic surgery, say experts who studied her appearance.

Dr. Steve Fallek, a board-certified plastic surgeon from New Jersey who has not treated Shirley, says: “She appears to be a prime example of what happens later in life when you’ve had too much work done.”