They share their birth date, which falls Sep 25, reports showbizspy.com.
According to American tabloid the National Enquirer, Douglas is keen to keep things amicable for the sake of their kids - Carys, 10, and Dylan, 13.
"Michael's pleading with Catherine to celebrate the birthday they both share - Sep 25 - in hopes that they can try to work things out," said a source.
"Throughout their marriage, they've always made that day a very special occasion between them. Michael's saying that if Catherine agrees to spend this next birthday together, he believes he can convince her that their marriage is worth saving," the source added.
The source also mentioned that Douglas has picked out an expensive gift for her.
--IANS (Posted on 19-09-2013)