And it was all with a little help from Ed Sheeran!
Jake dropped to one knee and popped the question to Jesy at the Manchester Arena, the venue where they first met, while Ed Sheeran performed their favourite song in the background.
An ecstatic Jesy later shared an image of the big moment to Instagram, saying: "I cannot believe what has just happened! The most surreal moment of my life and everyone that I love most was there to share it with us! I feel like the luckiest girl in the world rite now literally cannot stop crying! Future Mrs Roche."
Jake added on his own Instagram account: "A year ago today I met her at manchester arena, so it was only right, with a little help from my friend, that this happened. Best day of my life."
He also tweeted to Ed: "Travelled 5 hours to sing our favourite song on his day off. I will never ever be able to repay you. Love you pal. @edsheeran"
Jesy's Little Mix bandmates Leigh-Anne Pinnock, Perrie Edwards and Jade Thirlwall sent their congratulations via Instagram, saying: "It is beautiful to see two people so in love! What a gorgeous couple!"
Jesy is now the second member of Little Mix to be engaged. Perrie has been engaged to One Direction's Zayn Malik for two years.
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