Hong Kong singer Leo Ku, 53, kicked off the New Year by announcing that he and his 57-year-old wife, Lorraine Chan, have welcomed their second child, a baby boy.

The couple, who secretly registered their marriage in 2014 in Las Vegas, kept the pregnancy under wraps.

Judging from netizens and friends’ reactions online, the surprise announcement caught many off guard. Leo and Lorraine are already parents to five-year-old son Kuson.