The Bridget Jones's Baby star and celebrity makeup artist were spotted continuing their St. Barts trip Sunday – just weeks after a source told PEOPLE the two called off their divorce.
The 50-year-old Grey's Anatomy alum sported blue, patterned swim trucks while he and Jillian lounged on the beach.
Jillian, 50, flaunted her toned physique in a black bikini.
The estranged spouses have been working on their relationship after Jillian filed for divorce in January 2015.
The two first sparked reconciliation rumors when they were photographed holding hands in Paris in November.
A source told PEOPLE in January that the Dempseys "plan on being a family again."
"There are no more divorce plans," the source said.
"They seem very happy and are spending a lot of time together. They go on dates and are also involved with the kids together," the source added. "The divorce made Patrick miserable. It was definitely a wakeup call."
The couple has three children: Tallula, 13, and twins Sullivan and Darby, 8.