Now that they've gone 100% public with their relationship, Justin Bieber and Selena Gomez can't keep their hands (or lips) off each other!

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The two were seen having numerous public displays of affection yesterday while vacationing together in Maui -- taking time to kiss while jet-skiing, swimming and parasailing!

The young couple are on the trip with a chaperone -- Justin's mom!

Selena, 18, and Justin, 17, made their first public smooch Sunday night at the Billboard Music Awards.

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