Catherine Zeta-Jones has paid tribute to musical theater icon, Stephen Sondheim, after he sadly passed away at the age of 91. The Chicago star took to Instagram to pen a touching message after the master craftsman's death was confirmed. MORE: Catherine Zeta-Jones and Michael Douglas look so in love as they celebrate wonderful news togetherAlongside a photo with Stephen, she wrote: "R.I.P. dearest Stephen Sondheim.