You're not crazy—the couple haven't been dating very long, and they have been keeping it super low-key, with few public appearances and not a ton of PDA. They first emerged as a couple back in February 2013, though they first got close working on the 2011 film The Oranges together.
"Leighton and Adam are crazy about each other and have talked about getting married eventually," a source said to Star. "But she had no idea he would propose so soon! It was the surprise of her life and she’s ecstatic!” This engagement is a source of pure bliss for people who loved The OC and Gossip Girl, which aired just close enough to each other to make for a very specific public devotion to this couple. It's like Blair Waldorf and Seth Cohen getting married! What would Chuck Bass and Summer Roberts think?
What do you think of this engagement? Are they the cutest couple ever? Which other TV stars do you think would be perfect together? Tell us in the comments below or tweet us @OKMagazine.