I heard that one half of the unlikely pairing was 31-year-old Xtra Factor host Caroline Flack and the other is barely-out-of-nappies One Direction stud Harry Styles, 17, my jaw hit the floor.

My spies witnessed the pair in a clinch last Sunday at Londons exclusive W Hotel, where the cast and crew of the show were enjoying late night drinks and letting off some steam after a busy day at the office.

Harry clearly thought he had nothing to lose when he made his move on the presenter.

My spy reveals: You could tell Harry was loving every moment. He was poised ready for quite some time as they were talking, and in the end Caroline didnt say no.

They had a big passionate snog and it caused mild hysterics with the group of people they were with. They looked really into each other and left in a cab together, eventually going their separate ways much to the amusement of the group.

After their embrace Harry tweeted: Sometimes things happen and you suddenly get a whole new outlook on life. Ah, young love. Literally.

Even more hilariously, since they touched tonsils at the party, both Caroline and Harry have been tweeting about having sore throats and colds. Clearly they passed each other the lurgy!

Harry tweeted yesterday (shown, right): Woke up with man flu and a sore throat today.

Hours before, Caroline had tweeted: Woke up with the sorest throat and huge glands!!! Harry has made no secret about the fact hes fancied former Im A Celebrity... Get Me Out of Here Now host Caroline. In August he told the official X Factor website: If Caroline Flack is reading this, say Hi from me. She is gorgeous!

He even got his mate Tim Dean a producer on Xtra Factor to send Tweets to Caroline in September to persuade her to date him. One tweet from Tim read: @carolineflack1 I think you should consider dating @Harry_Styles hes oh so handsome + charismatic and defo not sat next to me now!

Obviously theres something rather creepy about the fact Caroline (pictured below, yesterday) is 14 years older than Harry, but there is no need for anyone to call social services Im told it was just a bit of one-off fun.

A pal reveals: She had a couple of snogs and things would never have gone any further. Shes laughing about it now.

Harrys a lovely guy, very charismatic and they get on like a house on fire. You forget how young he is when youre with him. Shes definitely not going to be following up the snog. They will stay friends, but thats about it.

- Dean Piper, Sunday mirror