On an upcoming episode of 90210, Naomi unleashes her inner bitch.

According to E! Online, Naomi (AnnaLynne McCord) will discover that Annie has been hooking up with Ethan (Dustin Milligan) - and, shockingly, she doesn't take it very well. Look for Naomi to go off at Annie's (Shenae Grimes) Sweet 16 party.

Annie will soon feel the wrath of Naomi Clark. Be afraid. Be very afraid.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.