An afternoon of good food, good wine, blazing sunshine and a stunning wife on his arm proved too much for Michael Douglas yesterday.

After a long, wine-filled lunch with wife Catherine Zeta-Jones and a few close friends, the Wall Street actor appeared to struggle to keep upright at the table.

Dressed down in a T-shirt and shorts, it appeared the combination of alcohol and humidity had left the Oscar-winning actor a tad weary.

Something funny Catherine? The actress laughs as husband Michael buries his head on her shoulder after a long lunch yesterday in Portofino, Italy

As his glamorous wife Catherine, 38, laughed and talked with their male companions, Michael looked increasingly worse for wear as the meal wore on.

By the time everyone had finished eating, the 63-year-old had fallen asleep on the Chicago actress' shoulder.

The millionaire pair have been cruising the Mediterranean this week on a yacht and after starting their trip off in St Tropez, the pair moved on to Portofino, Italy.

After their lengthy lunch, the couple retreated to their luxury yacht where Michael soon crashed out on one of the comfy sofas.

A kiss before snoozing: Michael snuggles up to Catherine

Rather sensibly given his slightly sunburnt face, Michael threw a towel over his face to protect his sun from the 82 degree heat.

The Mediterranean cruise is proving the perfect chance for the couple to enjoy some alone time, after they presumably have left their two children Dylan, seven; and Carys, five, at home with relatives.

Michael and Catherine, who have been married for over seven years, are enjoying a well-earned break after both filmed a string of movies over the past year.

The actor has a completed a succession of films due out for next year, including The Ghosts Of Girlfriends Past and Beyond A Reasonable Doubt.

Meanwhile, Catherine recently wrapped romantic comedy The Rebound and has another three projects lined up, including a biopic of late Hollywood bombshell Lana Turner.

Drink up: Dutiful Michael Douglas tops up his friends' wine glasses earlier in the afternoon