Former 98 Degrees singer Nick shared his happy baby news via Twitter on Tuesday night (15 July), saying that he and Vanessa are thrilled to be adding to their family.
Nick tweeted: "Can't think of a better way to celebrate 3 years of marriage to my beautiful @VanessaLachey than this! #family."
The couple are already parents to son Camden, nearly two.
Nick revealed that the new child will be a girl by sharing a photograph of Camden playing on the beach. The words 'it's a girl' have been carved in the sand behind him.
Nick Lachey (@NickLachey) July 15, 2014
Nick and TV presenter Vanessa married in July 2011 in front of a handful of guests on a tropical island.
Previously Nick was married to Jessica Simpson, Their marriage was documenting on the MTV series Newlyweds. His happy baby news comes two weeks after Jessica married long-time boyfriend Eric Johnson, the father of her two children.
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Stars who welcomed babies in 2014 in pictures:
Copyright: WENN Lexie Appleby/Future Image/Bridow/Instagram