Catherine Zeta-Jones has always been known for being fit and energetic in a way that separates her from several of her Hollywood peers, but this isn't what we expected to see at the start of the week.SEE: Catherine Zeta-Jones wows with stunning beach photos to celebrate happy family newsThe Welsh actress posted a throwback picture to begin the week, flashing back all the way to 2002's Chicago, one of her most successful movies.WATCH: Catherine Zeta-Jones teases exciting news in ab-baring cop top