A rep for the 41-year-old Late Night host confirmed the exciting news to US Weekly.
Seth and Alexi have been married since September of 2013, celebrating the occasion on Martha’s Vineyard in Massachusetts.
“He’s very excited for the next phase of his life,” a source told Us at the time of the wedding.
Seth usually keeps quiet about his marriage, but recently shared a sweet selfie with Alexi after they saw Tony Award-winning musical Hamilton on Broadway.
Congrats Seth and Alexi!