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It starts with going over your lines together. It continues when you both simultaneously reach for the last celery stick at the craft services table. It ends, if you're Shia LaBoeuf, in a flipped over truck with a broken hand and your co-star beside you. Some of Hollywood's most famous couples met on the job, so another year of films in the can, it's time to find out which of our hottest young stars just couldn't resist temptation on the set. Remember: if the trailer's rocking, don't come knocking.
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Blake Lively and Penn Badgley on location for "Gossip Girl" November 27, 2007 in New York City.
[ James Devaney/WireImage ]
