CATHERINE Zeta-Jones and Michael Douglas stepped out in New York on Wednesday to celebrate their joint birthdays.The veteran actor turned 68 while his wife reached the age of 43, and to mark the occasion they left their two children at home to enjoy an evening out together. The couple spent an hour at New York’s Carlyle Hotel before heading to the home of journalist Barbara Walters to continue the celebrations, according to The Daily Mail Online. –DM