Sassy “Shake It Off” singer TAYLOR SWIFT just shook herself up – by learning she can insure her famous legs for outrageously big bucks! 

The 25-year-old loves to show off her stems, but the pop princess was still shocked to learn their worth was estimated at a cool $40 million!

“It seems like a ludicrous sum, but if something was to happen to her legs, Taylor wouldn’t be able to give her signature stage performances,” a source said.

“Her $200 million career would be in big trouble.”

Taylor’s fellow gals with pricey gams include Heidi Klum, pop star Rihanna, Tina Turner, soccer superstar David Beckham and Mariah Carey – whose legs are said to be valued at $1 billion!

“If anything happened to her legs, Taylor wouldn’t be able to give her dynamic, signature stage performances,” said the source.The astronomical figure stunned the singer, friends said, but Taylor’s determined to follow through.

“She thought her legs were possibly worth a million,” the source added. “But $40 million shocked her. She’s even a little embarrassed about it.”

Taylor’s team is plowing through the paperwork now, claimed the source, adding: “She wants it all sorted out before her world tour starts in May.”