Demi Lovato has congratulated Kim Kardashian after it was revealed that she is due to have a baby with Kanye West.

The celebrity pair, who have been dating since spring, have just confirmed that they are expecting their first child together.

Family members - such as Kim's sister Khloe Kardashian - have been quick to congratulate the pair on their good news.

Demi Lovato has now got in on the act too, adding that she is "so happy" for Kardashian and revealing that she wants to babysit their offspring. The X Factor USA judge said:

"So happy for you @KimKardashian.. Love you SO much and I'm so excited to babysit!! Miss you girly.. Once again... SO happy for you!!! Xox."