Today is both Blake Lively and Rachel Bilson's birthday. The stylish starlets share more than the day they were born, though. On Gossip Girl and The O.C. — which sometimes seem like the same show just shot on different coasts — the two entertain love interests who have quite a bit in common. From the dorky outsider to the bad boy, see the types of men both Serena van der Woodsen and Summer Roberts have dated.
Serena vs. Summer: The Men They Love
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