It is thought the 24-year-old blonde beauty has recently split from One Night Only frontman George Craig, who she started dating in 2011.
A source told the Sun: "They've always had a soft spot for each other.
Three years after her debut, Diana released a follow-up album called Music to Make Boys Cry, which peaked at number 37 in the charts. She also performed in I Wish My Life Were A Musical in 2018, according to her CV.
It’s such a joy / emotional roller coaster playing Eurydice in ‘MYTH’ @theotherpalace The tale is a modern retelling of the Ancient Greek tale of Orpheus and the underworld. It looks like she may be returning to the music studio as she shared a hilarious video of her and her friend singing You’re The One That I Want from Grease at a karaoke bar.
The Kiss Me Hit-maker opened up about his split from Francesca to the Loose Women panelists earlier this month, while also rubbishing romance rumours about him and co-host Caroline Flack.
The 31-year-old X Factor presenter has wasted no time as he's said to be "casually dating Diana Vickers" after splitting with girlfriend-of-three years Francesca Thomas just a few weeks ago.
Last week it was reported Olly was getting close to the fellow former X Factor hopeful, as they both dealt with recent break-ups.