It's another boy for Michael Bublé and his wife

London - Michael Bublé has welcomed son Elias into the world.

The 40-year-old singer and his 28-year-old wife Luisana Lopilato are already parents to two-year-old Noah, and announced their new arrival on Twitter on Friday.

Alongside a picture of him and Luisana with their little boy, Michael wrote: "And then there were four. Introducing Noah’s little brother Elias."

In the snap, both Michael and Luisana are seen beaming for the camera, while little Elias curls up to his mother.

Lingerie model Luisana previously revealed that during this pregnancy, she has been craving fried eggs and peanut butter sandwiches, and wakes up at all hours of the night desperate to satisfy her cravings.

She shared with HELLO! magazine: "Unlike with Noah, I'm craving things like hamburgers, hot dogs, fried eggs, sweets. I try to eat healthily, but then I wake up at three in the morning wanting a peanut butter sandwich."

Luisana also revealed her love for black pudding has returned with her second pregnancy.

Asked if Michael makes the sandwiches for her, she said: "Yes. He's great. I also want to eat black pudding all the time. I felt that way giving birth, I couldn't stand it."