Using social media, Instagram, celebrity couple – singer John Legend and his model wife, Chrissy Teigen – announced they are expecting a second child.

In the video that features the couple’s first child, one-year-old daughter, Luna, Teigen might even have revealed the gender of the baby in the caption.

With the camera pointing at her tummy, Teigen asked her daughter: “Luna, what’s in here?”

“Baby,” the toddler replies, stroking her mother’s stomach.

Teigen cheekily captioned the post “it’s john’s!”.

Legend, 38, also posted a link to the Instagram photo on Twitter, alongside two baby emojis and two love hearts.

Luna was born in April 2016 after Teigen, 31, opened up about their fertility struggle and how she had undergone IVF treatment.

The couple tied the knot in 2013.