The music mogul is mentoring Emily in the girls' category this year, while Ryan was the wildcard choice for Nicole Scherzinger's boys' category. Both made it through to live shows after impressing at Judges' Houses over the weekend.
Phoning into Xtra Factor on Sunday night, head judge Simon was asked what he thought about the young couple's relationship.
"I did hear about that," said Simon.
"I think it's a good thing. It's happened on the show before. I think it makes it more interesting. When one of them goes, it's always interesting to see what happens on a night like that, when they're in competition with each other."
Ryan also appeared on Xtra Factor, where he revealed he'll be singing One Direction song 'Perfect' on the first live show. When Rylan quizzed if he thought about Emily when singing it, Ryan laughed: "Yeah, why not?"
The couple's romance became known as they progressed through the competition, but Ryan recently pointed out they'd met before X Factor and had been together for nearly a year.
Emily was the first to book her place in live shows after impressing Simon and his guest judges Emma Bunton and Mel B at the judges' houses in Malibu on Saturday night. A thrilled Ryan tweeted: "OMFG you have done it! My girl has made it to live shows! I am the proudest boyfriend in the universe. I love you."
And the following night it was Ryan who was celebrating, after he impressed Nicole Scherzinger and Calvin Harris in the South of France and won his place in the final three boys' spaces. Emily responded: "I am the proudest girlfriend in the universe. We are actually in live shows together! 'ARE YOU SERIOUS?' I love you."
5 After Midnight
X Factor's live shows start Saturday at 8pm on ITV.