Two weeks ago, reports emerged that Natasha and Ritchie were more than just friends when they were reportedly spotted kissing at a bar in Shrewsbury.
Natasha and Ritchie both took to Twitter to dismiss the claims, joking about the rumoured liaison. Ritchie asked: "@NatashaOfficial Apparently we kissed?! Have to ask, was I any good?"
Meanwhile, Natasha, who announced her split from husband of six years Riad Erraji in July, replied: "@RagztoRichez Cheeky!!! Although I find it amazing how peeps know more about my love life than I do x."
Since, Ritchie has seemingly confessed his true feelings towards Natasha, revealing that the pair have a close "connection".
But Natasha told Reveal: "Well we've been working together on a music project and yeah, apparently we're an item. You know people are going to write things if they see you together, but we're good friends and that's it."
Natasha and Ritchie, who both took part in the Great North Run over the weekend, have known each other since the beginning of their pop careers.
The friends were reunited when they signed up with their pop groups to take part in The Big Reunion earlier this year.
The Big Reunion: On Tour continues on Thursday 19 September at 9pm on ITV2.