Singer Christina Perri reveals that she's expecting her first child

Singer Christina Perri has revealed that she's expecting her first child with fiancé Paul Costabile.

The star, who's known for hits including Jar of Hearts and A Thousand Years, took to Instagram to share the happy news with fans, posting a black and white snap of her three-year-old niece Tesla cradling her growing bump, along with the cheeky caption 'guess what?'.

In a graphic laid over the photograph, she confirmed that 'Tesla's little cousin is coming soon'.

Christina's 993k followers were quick to congratulate her on the sweet announcement, with one exclaiming: 'Congratulations Christina! you are going to be an amazing mother! so excited for you and paul! 💖💖🎉🎉' and a second agreeing: 'Awww so happy for you @christinaperri !!!! 👶🏻🎉💕'

Christina and American TV host Paul met when he interviewed her four years ago, and in June of this year the pair excitedly announced their engagement.

'I knew I wanted to ask this girl to marry me the day she walked into the green screen for an interview almost 4 years ago. I finally asked her right here tonight and she said yes!!!' Paul wrote on social media at the time.

Christina herself shared a picture of the stunning diamond ring Paul had presented her with, adding: 'paul asked me to marry him tonight & i said yes!'

Throughout their relationship, the pair have typically remained very private about their personal life, and have not yet disclosed any further details about Christina's pregnancy, such as her due date or the baby's gender.

Their upcoming marriage will the the second for Christina, who split from her first husband at the age of 22.

'It was really fast, like a stepping stone from one path to the next,' she told The Mirror in 2012. 'We ran to Florida and eloped. It didn't make any sense. I felt like a different person in a different life — I had a house, a dog, and a car.'

'I woke up one morning and wasn't playing music or feeling fulfilled in any capacity and realised I had to make a change. He and I are still friends. We giggle about it now: "Remember the time we were married?". We've moved on.'