Catherine Zeta-Jones and Michael Douglas have travelled to one of their favourite islands to enjoy a sunny family holiday – Mallorca, in Spain.MORE: Catherine Zeta-Jones causes a stir with striking new photosThe couple have been on the island for over a week, even though they've decided not to publicly share any holiday photos on social media. WATCH: Catherine Zeta-Jones struts her stuff inside her incredible walk-in closetThey're accompanied by their two children, Carys and Dylan, and Michael's