Dusk Till Dawn (John JC Carr Remix) ZAYN feat. Sia
Olly Murs and Caroline Flack's have sparked rumours that their friendship may be shifting up a gear.
The Xtra Factor presenters were apparently spotted in a backstage clinch as they watched the sing-off between Misha B and Sophie Habibis on The X Factor live show last weekend.
A source said: "Olly and Caroline didn’t realise anyone could see them. But Olly had Caroline pulled in to him and was pressing his hips into her. He was holding her with his arm around her waist.
"He was stroking her arm like a boyfriend and whispering gently in her ear. She smiled back, smitten."
But the pair apparently let go of each other when they were spotted by someone.
"He looked extremely guilty and then pretended to play on his phone," the source added to the Metro.
There has been huge speculation about the pair's off-screen relationship since they began hosting The Xtra Factor this year.