Catherine Zeta-Jones and Michael Douglas already have an 18-year-old daughter. The famous couple did not hold back when it came to wishing their grown up daughter, Carys, a happy birthday on social media.A post shared by Catherine Zeta-Jones (@catherinezetajones)On Tuesday, the 51-year-old took to Instagram to post an album of photos that showed Carys as a young baby and as the young woman that she is.