The very private couple have not commented on the claims that Leighton is pregnant, but photos appeared online overnight showing the former Gossip Girl actress sporting a prominent baby bump while out in LA.
Leighton and The O.C. actor Adam have always kept their relationship away from the spotlight.
They married in secret in November 2013, only confirming the nuptials several months later. And even then, the confirmation was a simple 'yes' when asked by photographers on the street.
Even when asked about working together on Broadway's Of Mice and Men, private Leighton kept the conversation firmly professional.
"Of course [I enjoyed working with him]. I always want to work with people I like and love and that I'm friends with, so it's nice to mix business with pleasure, I guess."
Congrats to Leighton and Adam!
Check out some of the best maternity fashion below: