The Big Brother's Bit On The Side host was on today's This Morning updating Holly Willoughby and Phillip Schofield on the latest showbiz news, which included Liam publicly calling Cheryl his "favourite woman" yesterday.
Rylan said: "It's so lovely, I really hope this is true. Apparently she's been staying at his and it's all lovely. If this turns out to be some joke that they just thought, like early April Fools, I'll be devastated. I've really bought into this. I'll be fuming!"
Liam, 22, cemented their relationship status by sharing a cute Instagram for International Women's Day, featuring a photo of Cheryl and the caption: "Happy #internationalwomensday to my favourite woman in the world. Hope I make you as happy as u make me X."
The One Direction singer and Cheryl, 32, are thought to have begun dating after bumping into each other at the X Factor finale in December, after Cheryl's split from husband Jean-Bernard Fernandez-Versini.
After news of their romance leaked, they appeared to confirm it by sharing a black and white selfie to Instagram showing Chez cuddling up to a shirtless Liam.
She later joked about her "mystery man" in Instagram posts featuring Liam, before Liam shared a photo from the same day to his Instagram featuring them both.