The Baby hitmaker and his Disney star girlfriend were taking a walk on the beach when they overheard the star's music being blasted at a wedding party nearby.
And the couple couldn't resist gatecrashing the bash and posing for pictures with the wedding guests, according to PerezHilton.com.
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"He was cool enough to make a cameo, which surprised all of the wedding guests. He even took the microphone, congratulated the newlywed couple, and said a few nice words, while posing for a series of pictures with his fans. That was one of the coolest and nicest things a person of his celebrity can do, and it certainly made a memorable night for the newlywed couple Mr. and Mrs. Rob and Jeanine McCool."
[via - uk.omg.yahoo.com]