The One Direction hunk, 21, took to his Twitter account to jokingly propose to the 'Bang Bang' hitmaker, 26, after she wowed him with her sexy performance on the UK's 'X Factor' this evening.
He tweeted: "@JessieJ marry me ! (sic)."
The brunette beauty - whose real name is Jessica Cornish - is yet to reply to the singer's question.
However, this isn't the first time Niall has popped the question to a fellow celebrity on the social networking site as last year he asked Katy Perry to marry him.
He tweeted after she performed on the singing competition's results show last October: "I love you @katyperry! Thank you! Ps. Will u marry me?"
Last November, Niall took to his Instagram account to post a photograph of himself, his band mates and the 'Roar' hitmaker, 29 - who was dating John Mayer at the time - to tell his fans she had accepted his proposal.
He wrote alongside the snap: "She said yes ! It's happening! Haha (sic)."
It seems Niall will always have a soft spot for Katy - who is now believed to be single - as she helped kickstart his career in 2010 when she requested that he join the boy band, alongside Zayn Malik, Louis Tomlinson, Liam Payne and Harry Styles, after he initially auditioned for the 'X Factor' as a solo artist.