Justin Bieber and Selena Gomez are wedding crashers!

The teen couple recently popped up at a Malibu beach wedding after hearing the Bieb’s hit “One Less Lonely Girl” playing at the reception.

According to our sources at Rob and Jeanine McCool’s wedding … Bieber and Gomez were strolling on the beach when they heard Justin’s hit “One Less Lonely Girl” playing at the reception — inside the historic and shi shi Adamson House.

We’re told Justin snuck up on some guests — who predictably OMG’d and LOL’d — and then hopped on the mic, saying … “We just crashed it. We heard a party so we decided to just come. So let’s party.”

Biebs and Selena only stayed for about 10 minutes to pose for pics — including some with the happy couple — and then bolted.

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JB in concert: enough to make a teenage girl cry.  JB at your wedding: priceless!