BARBRA STREISAND is sparing no expense to make sure her first Academy Awards performance since 1977 is one that nobody will ever forget.

To achieve that goal, sources say she’s undergoing a million-dollar makeover!

In preparation for her Feb. 24 performance, the 70-year-old legend of stage and screen has hired personal trainers and a nutritionist, and flown in “facial specialists” from Europe. She’s also installed a state-of-the-art gym, a performance studio and a meditation room in her Malibu mansion and ordered several custom designer gowns so she has options for the big night.

“All told, Barbra will have spent almost $1 million,” said a source, adding that the “Guilt Trip” star wants to drop at least 20 pounds from her 5-foot-5 frame.

And after years of saying she’d never undergo plastic surgery, Barbra has reportedly been flying to New York to visit the office of Dr. Patricia Wexler for “facial fat transplantation” procedures. This involves taking fat from a patient’s thighs and injecting it into the face to fill wrinkles.

“She also brings in facial experts from Europe regularly and will have them on-call throughout Oscar week,” continued the source.

Since Babs intends to be dressed to the nines for the show, she’s asked her close friend, designer Donna Karan to create “at least five one-of-a-kind couture gowns,” which will cost at least $100,000.

She’s also been tuning up her vocals in her new home recording studio and meditating in her yoga studio to calm her famously jittery nerves.

Said the source: “Barbra’s spending a million dollars to make sure that her Oscar night performance is perfect – for herself and for everyone else.”