Michael Buble and his wife Luisana Lopilato are expecting their second child.

The Cry Me a River singer and his Argentinean wife already have 22-month-old son Noah together. And on Monday, the 39-year-old confirmed that the couple are set to welcome baby number two.

'Noah has some news for to tell you ...(sic)' he wrote on Instagram next to a video of his son.

In the footage, his little boy can be seen wandering around in a pair of Minions pyjamas.

'Whos that in there?' the singer asks and Noah wanders over to Luisana who is lying on the floor with her stomach exposed. The little boy prods his mother's tummy with his finger a couple of times and then replies 'Baby'.

Michael and Luisana tied the knot in March 2011 in Buenos Aires after meeting at one of his concerts in the city two years previously. However Luisana previously admitted that she thought her husband was homosexual when they were first introduced.

'I was there with my sister and a really handsome male actor friend I worked with, and Michael came up and asked us to come to the after-show party,' she recalled to British newspaper The Mail on Sunday. 'I didn't speak English, but my male friend did and Michael was talking to him and saying things to him like, 'Oh my God, look at your muscles.' I just thought he was gay; I rang my mum and said, 'I am at a party with Michael Buble, and he's gay!'

Thankfully the couple overcame the language barrier and Michael wrote his hit song Haven't Met You Yet for her; she also starred in the video.

Currently there are no further details on the due date of their second baby.