The lovebirds, both 67, hope to explore Italy, Spain, Portugal, France and Germany in the spring, sources said.
Insiders said Harmon will take time off from his top-rated CBS drama, NCIS, whether or not it’s renewed for a 17th season.
Dawber left showbiz after starring with Robin Williams in the sitcom Mork & Mindy to focus on raising sons Sean, 30, and Ty, 26.
“A lot of people look up to Pam and Mark as the perfect couple, but Mark wants to put the spark back in the marriage with this trip,” said the source. “They put family first and take time for themselves!”
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