A year after her very public meltdown, Britney Spears is back to work and out of trouble. But what has the comeback cost her? Rolling Stone has Britney’s full story in the issue of Rolling Stone that hits newsstands this week. “I feel like an old person now,” Spears tells RS’s Jenny Eliscu. “I do! I go to bed at, like, 9:30 every night, and I don’t go out or anything, you know what I mean? I just feel like an old fart.” Spears says she’s considering lopping off the weave she’s worn since shaving her head in 2007, and counts up her tattoos (they now number seven), giggling.