Chrissy Teigen and John Legend announce that they're expecting their second child

Chrissy Teigen has shared a super sweet video confirming that she's expecting her second child with husband John Legend.

The 31-year-old model unveiled her exciting news after sharing an adorable clip featuring her firstborn Luna to her Instagram page.

The video starts with Chrissy pointing to her bump asking 19-month-old Luna 'what's in here?', to which the tot replies with glee: 'me!' You can hear laughter before mum prompts 'is it a baby?'.

The Lip Sync Battle presenter - famed for her humour - captioned the sweet family video simply with 'it's Johns!'

However, equally hilarious John made sure to chime in as he commented underneath 'Maury will have the final word on this', referring to TV host Maury Povich who is famed for his 'You are NOT the father' catchphrase.

Since Chrissy revealed the couple's lovely news, the video has had 3.2million views and over 20k comments wishing them congratulations.

One fan referred to Chrissy's caption: '"It's John's" @chrissyteigen you crack me up!! Congrats, mama! So exciting!! Love Luna's sweet little voice and announcement.'

Another couldn't hold back their excitement, using all capital letters to exclaim: 'FAV COUPLE MAKING MORE BEAUTIFUL TINY HUMANS.'

'Congrats to your beautiful family,' wrote a third fan.

Mum-to-be Chrissy has always talked very openly about wanting to expand her family, recently telling E! News she would love to be 'pregnant for the rest of her life'.

She added: 'I feel good, I feel good, we're still trying ... I'm going for I mean hopefully in the next few years because for me I really want to just knock 'em out.

'That's my dream, I want to just be pregnant kind of for the rest of my life. Not for the rest of my life, but the rest of my fertile life. So we'll see.'

Chrissy and John, 38, married in Lake Como, Italy, in 2013 and welcomed Luna in April 2016.