Katie Holmes andJamie Foxxkicked off the last weekend of 2018 in style.

The couple, who have mostly kept theirfour-and-half-year romanceaway from the public eye, were spotted aboard a private yacht in Miami on Friday.

They both kept it casual for the trip: Holmes, 40, wore a pink pinstripe crop top with matching shorts, while Foxx, 51, sported a black t-shirt and jeans.

Prior to their evening out, the pair spent the day lounging on the luxurious boat, with Holmes rocking a black bikini and Foxx keeping it chill in a white t-shirt.

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“Katie was all smiles,” a source told PEOPLE. “She and Jamie were flirty.”

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The actorswere first seen dancing togetherin 2013 in the Hamptons, a year after Holmes and ex-husbandTom Cruise, 56,called it quits.

Though both have had busy schedules in the last few months, they’ve made efforts to see each other regularly. In November, the two spent time together in New Orleans, where she was filmingThe Secretand he was working on an untitled sci-fi thriller for Netflix. Foxx visited Holmes on her set and they also enjoyed a romantic dinner date atthe trendy Restaurant R’evolution in the city’s French Quarter.

“Their relationship seems so much more serious this year,” a source told PEOPLE in this week’s issue, on newsstands now. “Katie and Jamie keep having public dates, and although they try to not be photographed together, they are clearly not as concerned about keeping their relationship private.”

In September, Holmes made frequent trips to visit Foxx while he filmed his upcoming movieJust Mercyin Georgia, where theyenjoyed a bike rideand agym sessiontogether.

“Katie always acts super-excited and giddy when Jamie is around,” said an insider. “They are very cute together.”

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A source told PEOPLE in May the two “are still careful about being photographed together.”

“Everyone knows they are dating, but they still want to keep it private,” the insider said. “After the beach pictures, they only spent time together at home and got extra careful. But this year, they have been more social together. They often go to restaurants for dinner dates, or to hang out with friends.”

source: people.com