17 July 2012 2:00 PM, PDT | PEOPLE.com | See recent PEOPLE.com news »

There may be a happily ever after for two stars of Once Upon a Time. Following in the footsteps of Ginnifer Goodwin and Josh Dallas - whose relationship became public in April - fellow costars Jennifer Morrison, 33, and Sebastian Stan, 28, are an item, too. "They met on set and are now exclusive," a source tells People. "They started dating three months ago. They seem to be really happy together, but are trying to take things slow." This isn't the first time either half of the pair has gotten cozy with a costar. Stan formerly dated Leighton Meester when they were both on Gossip Girl, »

- Dahvi Shira

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