Britney Spears is acting like money grows on trees! Although the pop star is on a strict $1,500-a-week allowance monitored by her father, Jamie, she recently shelled out nearly $750,000 to completely renovate her Calabasas, Calif., home — including $150,000 on new furniture, $200,000 on artwork, $100,000 on a new bathroom, $150,000 on electronics and even close to $100,000 on Venetian plaster walls. “Britney remodeled her entire home,” her friend reveals. “She loves spending money and was able to persuade her father to give it to her.” On February 10, Britney, 29, was also spotted with her bodyguard trying out a sleek, custom Maserati in LA. “They were test-driving this amazing car, but oddly she never got behind the wheel,” says a witness. “Her bodyguard took it out for a spin, while she talked on the phone.” Britney did go low-budget on Valentine’s Day though: She and boyfriend Jason Trawick were spotted at a McDonald’s drive-thru. “Britney loves bargain stores like Target, but she can have very, very expensive tastes, too,” says a friend. The Maserati sports car Britney was checking out sells for about $150,000, which is tough to afford on her weekly allowance.