‘Cause baby, he’s a firework!

Katy Perry and Justin Trudeau were snapped smooching on the pop star’s yacht , confirming recent rumors about their relationship.

In the photos, which were taken in September, the “Roar” singer, 40, wore a sleek one-piece swimsuit on the deck of the Caravelle while the former Canadian Prime Minister, 53, was just clad in a pair of jeans.

The couple enjoyed a passionate kiss, and at one point, Trudeau cradled Perry’s bottom as they hugged on the upper deck.

The photos were reportedly taken off the coast of Santa Barbara, Calif., by an eagle-eyed tourist.

“She pulled up her boat next to a small public whale-watching boat, then they started making out,” a witness to the encounter told the Daily Mail. “I didn’t realize who she was with until I saw the tat

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