Shania Twain turns 50 today, adding another milestone to a 25-year career that's full of landmark albums, chart-topping hits and bare midriffs. To celebrate, she's gearing up for another leg of her Rock This Country tour, which will help bring her days on the road to a close. "I want to write more music," she told Rolling Stone Country this summer, explaining her decision to retire from performing once the tour wraps. "I'd like to spend a lot more time doing that. I'd like to make more records. I want to write for other people. I'd like to write more books." If that sort of "retirement" sounds busy, take a look this collection of photos from Twain's career, which just how how active she's been since kicking off her career in the mid-Nineties.