OK! Exclusive: Taylor Swift Getting Her Butt In Shape For Calvin Harris

She may have legs worth $40 million, but now Taylor Swift wants a booty to match—and it’s all for her new boyfriend Calvin Harris!

The 25-year-old singer has been hooked on the gym for months. OKMagazine.com reported back in January that Tay has been doing up to 1,000 squats a day, but now she’s working out around the clock, according to her pals.

“Taylor does at least a couple hundred squats before breakfast and throughout the rest of the day she makes sure to do the same again, so she’ll be squatting in the shower, in the elevator, even in airport lounges,” her friend told OK! exclusively. “She’s determined to get a firm peachy butt but she’s turning into an obsessive squat-aholic.”

The insider said her addiction to get killer curves even keeps her up at night, especially since Calvin and his mega-hot bod entered the picture!

“She still does a quick 20-minute mid-morning session of crunches and squats, but she finds working out at night helps her sleep better,” the source said. “She read that it increases endocrine hormones in the body and she swears by it.”

According to her pal, the results are paying off and she’s “really happy with her sexy new shape and determined to keep everything all toned.”

No wonder she’s become so workout-crazed since hooking up with DJ Calvin Harris last month. The Armani underwear model definitely looks great shirtless!