Kate Hudson, 41, just revealed her brunette roots on her Instagram Story and asked fans if she should stay "au naturale" or go back to blonde.The actress also showed off her toned abs, which she credits to Peloton and Pilates. Hudson has also been incorporating yoga with daughter Rani Rose into her at-home workout routine.Actress Kate Hudson, 41, just shared a mirror selfie on her Instagram Story wearing a cute and cropped tie-dye two piece outfit, showing off her super toned abs.