Brian Austin Green, Megan Fox Sued for Alleged Brutality on the Beach

Brian Austin Green is being sued by a celebrity photographer who claims he was brutally beaten by the actor as his wife, Megan Fox, egged him on.

Delbert Shaw claims in a lawsuit that will be filed this morning in L.A. County Superior Court ... he was taking pics of the smoking hot couple last December on the beach in front of the Four Seasons Resort in Hualalai, Hawaii ... when Brian and Megan allegedly made verbal threats against Shaw.

According to the suit, it escalated when Megan yelled to her hubby, "Are you going to let him get away with that?"

Shaw alleges Brian defended Megan's honor by hauling off and pummeling him, causing severe injuries. To add insult to injury, Shaw claims Brian threw his iPhone into the deep blue sea.

Shaw says Megan was egging Brian on during the entire incident.

He's suing for unspecified damages and is represented by attorney Sark Ohanian at the law firm of Carpenter, Zuckerman & Rowley, LLP in Beverly Hills.