Kate Middleton and her sister Pippa Middleton are back in the news and this time, the reason is Prince Harry. If the latest royal gossip is anything to go by, then it looks like the Duchess of Cambridge's younger sister and her brother-in-law have been involved in a secret love affair over the last couple of months, which was busted by Kate.

The latest reports have claimed that Prince Harry and Pippa, who have apparently liked each other for years -- since the time they met at Kate Middleton and Prince William's wedding, have been enjoying a secret romance for a few months now.

Gossip magazine OK! (via Daily Mail) has reported that the younger siblings of both the Duke and Duchess of Cambridge have been secretly meeting for the past three months and have even been caught red-handed by the mother-of-two royal children.

"At one point, Kate went to check her make-up and found them snogging in a bathroom. And she was unhappy with the incident," a source said.

The report, while pointing out at the fact that both Harry and Pippa are freshly single and out of their previous relationships, said that the two of them have fancied each other for years.

"There's always been sexual tension between them, even when they were dating other people," a source added.

Well, the report further said that Prince William isn't happy with this either and disapproves of the "love affair" and that the Palace hasn't still commented on the matter yet. But, will this cause tensions between Kate and Pippa again?

Just a few weeks ago, the Middleton sisters were reportedly having a feud with Pippa blaming elder sister Kate for her failed relationship and career. The Duchess of Cambridge was actually upset that her younger sister was using her royal connections to get her way out.

"The manipulative matriarch of the Middleton family is fuming mad that the Duchessof Cambridge is no longer acquiescing to Pip's ridiculous requests. Tension's running high in the Middleton family over this situation and Duchess Kate feels Prince William is the only person she can trust anymore," a source had reportedly said, after Pippa's high profile break-up with Swiss banker Nico Jackson.

And when things went out of control, Kate reportedly chalked out a business plan to rescue her sister's career and to settle sibling feud. Princess Charlotte's mother reportedly was planning to set up her own organic food company, for which she was seeking some help from her sister.

Now, only time will tell if there's any truth in Pippa Middleton-Prince Harry dating rumours and whether Kate Middleton and Prince William approve of it.