"The Big Bang Theory" star and his wife, Jocelyn Towne, have welcomed their second child, a baby boy named Wilder Towne Helberg, according to Us Weekly.
Helberg, 33, who plays bawdy engineer-turned-astronaut Howard Wolowitz on the CBS sitcom, welcomed the child with Towne on April 23, his rep told the mag.
On June 12, the pair teased to Wilder's arrival during a Reddit Q&A for their joint venture "I Am I," which Towne directed, wrote and produced.
"We are Jocelyn Towne and Simon Helberg, married working filmmakers who made 2 babies and 2 films in the last 2 years. AMA!" they wrote.
Helberg and Towne wed in 2007 and are already parents to daughter Adeline, born in May 2012.
Towne, 37, also an actress, sweetly cradled her growing belly during photo ops on January's SAG Awards red carpet, where they made the announcement that they were expecting again.
Helberg's rep did not immediately reply to The Times' requests for comment.