It is thought to be Olly's first serious romance since he split from long-term girlfriend Francesca Thomas at the end of 2015.
However the brunette beauty did first hint that the pair were more than just friends in December previous year as she shared a sweet post online.
A source told The Sun that the pair met through a mutual friend and hit it off straight away.
'Mel loves a younger man and really fell for Olly when he got into shape late past year, ' they said.
Mel is known to be a big fan of posting the impressive results of her workout sessions on social media, and she and the former X Factor victor are said to have got close over her fitness regime.
"He was a fan of her gym selfies and thought she had an incredible body".
Ooh-er. The pair are said to have enjoyed quiet date nights at each other's houses, with both keen to keep the budding relationship under wraps. They started texting for ages and some of the messages ended up getting quite saucy.
But those following Melanie's Instagram page might've wondered if something was going on between the pair, after the Manchester girl heaped praise on Olly's track Flaws back in December. You sound like an angel. He replied with a kiss emoji, adding: "Awwww thanks babe".
"I don't think I'm ready to meet anyone else just yet". I have to say, for me obviously, there will never be another dog like him.