That Simon Cowell's a right tease, isn't he?
In a clip from the new series of The X Factor USA Simon can be seen winding up his fellow judge, 20-year-old Demi Lovato about her rumoured romance with One Direction's Niall Horan.
After Demi tells Simon that Niall said hello, he replies: "Keep away from him. He's pure."
Demi insists that nothing's going on between them, saying: "I'm not looking for anything. I'm not going to date anybody for a whole year. And I made that clear to him."
However, when Simon asks her if they've done any smooching, Demi gets all embarrassed but says she hasn't.
"It's what people are thinking," Simon jokes.
Rumours about Demi and Niall dating started in June when the 1D star told Ryan Seacrest he'd been in contact with her.
"We've spoken alright, yeah," he teased during an appearance on Ryan's radio show. "So, I got in contact with her.
"She's really nice. I don't know what's going to happen."
The X Factor USA returns to Fox 12 September.