Hilarie and her husband The Walking Dead’s Jeffrey Dean Morgan were all smiles on the carpet, as they posed with both of their hands resting on Hilarie’s bump.
The couple, who tied the knot in 2014, are already parents to a 7-year-old son Augustus, who they call Gus.
The pair are notoriously shy about their relationship, which makes their public announcement such a surprise.
The TV heavyweights met back in 2009 when they were introduced by Supernatural’s Jensen Ackles, who is a mutual friend of both Hilarie and Jeffrey.
Hilarie is best known for her portrayal of Peyton Sawyer in the early noughties hit series One Tree Hill alongside Chad Michael Murray, Sophia Bush and James Lafferty.
Jeffrey hit the small screen in Grey's Anatomy in 2006, as Denny Duquette, a hospital patient who needed a heart transplant.
Since then, Jeffrey has had roles in Shameless, The Good Wife and The Walking Dead.
Congraulations to Hilarie, Jeffrey and Gus on this wonderful news!