Bride-to-be ANGELINA JOLIE plans to undergo an extreme plastic surgery make­over before she weds Brad Pitt!

Sources say the 37-year-old “Tomb Raider” star desperately wants a head-to-toe overhaul, and an expert estimates it could cost her a cool $45,000.

“Angelina believes she looks old and she’s tired of it,” said an insider.

“She’s freaking out over the frown lines on her forehead, her jowls and a few pockets of fat that she’s spotted on her tummy, butt and thighs.

“But this isn’t really about weight. Angie’s main worry is that her body is starting to sag, which she absolutely hates.

“She can’t live with the idea of walk­ing down the aisle with wrinkles and lumps, so she’s determined to get all the treatments she needs before the big day.”

The mother of six is set to wed Brad, 49, early next year at their sprawling estate in southern France.

The “Moneyball’ hunk recently con­firmed the couple’s upcoming nuptials, telling reporters: “It’s soon. I got a good feeling about it.”

But his upbeat prediction offers a stark contrast to his fiancée’s gloomy at­titude, say insiders.

“Angelina has been very depressed about her looks,” revealed a second source.

“She’s consulted cosmetic surgeons in Europe about various touch-ups and high-end laser treatments.

“She’s also looked into getting li­posuction on her butt and thighs as well as having fat sucked out of her belly – because believe it or not, even Angelina has developed middle-age spread!”

Meanwhile, some sources believe the Oscar-winning beauty has already started her makeover with Botox injec­tions.

In the U.K. on Nov. 18, Ange­lina hosted a screening of Ewan McGregor’s “The Impos­sible” – a true story of a family caught in Thailand’s 2004 tsu­nami. An insider said it looked as if she had gotten too much Botox “because when she smiled, her face didn’t move.”

If the “Salt” beauty goes under the knife of top doctors in Beverly Hills and Europe, it’ll cost her tens of thousands to get the look she wants, according to Michigan-based plastic surgeon Dr. Anthony Youn, who has not treated the actress.

She’ll fork out $6,500 for Botox and injections of other facial fillers, plus $11,000 for a mini face-lift and $2,500 for Fractora Fractional Skin Resurfac­ing to tighten remaining facial skin, he said.

A Venus Freeze procedure for skin tightening, cellulite reduction, and removal of smaller fat deposits would cost $3,000, while liposuction for larg­er fat deposits would run $9,000.

After giving birth to three children, including twins, Angelina would likely need a $10,000 mini tummy tuck. As a final touch, laser hair removal would set her back $3,000.

But according to Dr. Youn, the screen sexpot would heal in two months.

“Angelina believes she can look as youthful as she did in her Lara Croft days for her wedding,” said the source. “And she’s willing to spend whatever it takes to achieve that.”