Leighton Meester [1] was positively glowing while out and about with husband Adam Brody [2] last Saturday, and it's pretty clear why — she's pregnant! The former Gossip Girl [3] star and the O.C. actor stepped out for a lunch date in LA, and Leighton showed off her growing belly in a tight gray t-shirt; the couple was all smiles as they headed to their car after a meal. It's the first child for Adam and Leighton, who tied the knot in a secret ceremony [4] back in February 2014. After multiple PDA-filled sightings around NYC and LA, they made their first official red carpet appearance [5] in June of that year when they attended the Tonys. There have been rumblings of a possible pregnancy for Leighton since October, when she covered Nylon magazine [6] and talked about having kids in the accompanying article. Earlier this month, she was spotted with a tiny bump while performing on stage [7] in Vancouver. Needless to say, we're betting Leighton and Adam's little one will already have a BFF in Blake Lively [8]'s daughter, James. Keep reading to see photos!

Want more Leighton and Adam? Check out these posts:

• Why Blair Waldorf and Seth Cohen are perfect for each other [9]
• Leighton and Adam's postwedding PDA [10]
• Adam and Leighton make their first red carpet appearance as a couple [11]
• Find out what the cast of The O.C. is up to now [12]