If the term "frenemy" was first used as far back as 1953, why does it take so many of us too long to acknowledge when we are one, or have one? Sure, it's easy for us to spot frenemies when they're famous -- we think of Kate Hudson and Anne Hathaway in Bride Wars, Lindsay Lohan's friendship with The Plastics in Mean Girls, and clearly, Gossip Girl's Blair Waldorf shouldn't trust her "best friend" Serena van der Woodsen. While glaring acts of treason reveal the darkness of these celluloid relationships (they sleep with each other's boyfriends, they spill each other's darkest secrets, sabotage each other's weddings) in real life, relationships with enemies disguised as friends are harder to spot. Read on for some helpful clues to figure out if you're safe or swimming with sharks.

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