Ben Affleck is 'icing on a delicious cake' for Jennifer Lopez as couple gets handsy during her birthday trip

Jennifer Lopez just celebrated her 52nd birthday with Ben Affleck on a luxurious yacht in the South of France. 

The singer-actress made their rekindled relationship Instagram official on Saturday. A source told Fox News, "[Lopez] is accepting the gift of happiness at this stage in her life and the love she and Ben share is icing on a delicious cake."

"Jennifer is happy and appreciative that into her 50s she can still do what she loves doing – which today, allows her to feel younger given her overall approach to health consciousness and the fact she keeps herself very active," the source added. "She has health and family which is all she needs to make herself whole."

The pair jetted off to the French Riviera and were snapped relaxing on a luxurious yacht and partying at a club in St. Tropez. She donned a $650 bikini and matching $2,300 cape, both by Valentino.

JENNIFER LOPEZ CELEBRATES 52ND BIRTHDAY WITH BOYFRIEND BEN AFFLECK IN STEAMY PHOTO SHOOT

Lopez and Affleck, 48, were first spotted together in late April after she ended her engagement to Alex Rodriguez just a few weeks earlier. The "Hustlers" star and the "Argo" director were originally together from 2002-2004. 

While enjoying the Southern France sun, JLo and Affleck even recreated his famous butt grab from her music video "Jenny from the Block."

In the hit 2002 video, Affleck plays her love interest as Lopez sings about not forgetting her Bronx, New York roots despite fame and fortune. 

JENNIFER LOPEZ, BEN AFFLECK PARTY IN FRANCE FOR HER 52ND BIRTHDAY

An insider told E! News, Bennifer couldn't keep their hands off each other while sailing around. "They held hands, they hugged each other close and they kissed," the insider described. "They sailed around from Monaco and went to St. Tropez. Ben and JLo spent time laying out on the top deck and making out. They couldn't get enough of each other."

Later, the Hollywood sweethearts spent Saturday night partying in France at the L'Opera.

Fashion blogger Rebel Neda, who was present during the celebration, told Fox News that Lopez and Affleck arrived at around 9 p.m. with four people, including two bodyguards and a personal photographer.

"They were all drinking and being happy, kissing all the time and super in love. They were very friendly and the Opera shop gave them two bags of presents from the artist Philip Shagnti collection," Neda wrote in an Instagram direct message. "Opera is a very professional and crazy place at the same time and Ben and JLO felt very comfortable and had the time of their life with the crazy personal birthday show that Opera gave them. They got a lot of attention but they loved it."

JENNIFER LOPEZ, BEN AFFLECK MAKE INSTAGRAM DEBUT IN VIDEO FROM LEAH REMINI'S BIRTHDAY PARTY

"I don’t know exactly how many people there were but a lot! And they all enjoyed it," Neda told Fox News. "They stayed until the closing time 3:00 [a.m.]." 

Meanwhile, Lopez's ex-fiancee, ARod, was also on a yacht in South of France at the same time. Another insider told E! News that their vacation location wasn't a coincidence. 

The former Yankees slugger, 45, was seen enjoying the blow-up slide throughout the day, making a big splash each time he hit the sparkling blue water.

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A source explained "before they broke up, J.Lo and A-Rod had planned a trip together to the French Rivera for her birthday. Ultimately, he decided not to change his plans and still go—and she also decided to keep her trip but go with Ben, which is why they're all there right now."

Fox News' Julius Young and Cortney Moore contributed to this report.