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And the couple couldn't resist gatecrashing the bash and posing for pictures with the wedding guests, according to PerezHilton.com.

A partygoer tells the blogger, "Unbeknown to all of the guests, Justin Bieber and his girlfriend Selena Gomez were just done eating at a restaurant up the road from the Adamson House estate and had decided to take a stroll down the beach. I guess he heard his song play and decided to crash the wedding party to check the scene out.

"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."