The couple, who are spending the week together at the Cannes Film Festival, looked relaxed as they floated around on businessman Roman Abramovich’s yacht Eclipse, with Perry sitting close to the hunky actor.
Perry, 31, donned a blue, star-covered romper and retro sunnies, while Bloom covered up in a baseball cap.
A source tells PEOPLE that the pair looked “definitely in love. They were very close, very smiley and seemed to be just one with one another.”
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The group also grabbed lunch at La Colombe d’Or, a famous hotel not far from Cannes, with Kate Moss.
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Breaking her silence on the outing on Thursday, Perry tweeted, “Instead of giving energy & eyeballs to dumb conspiracy check out how [COOL] this is,” alongside a link to the actor’s Time article about his UNICEF ambassadorship.