Happy and incredibly relaxed together, they look like they’d be the best fun.

However, things weren’t always so easy for William and Kate.

In fact, they went througha rough patchearly on in their romance.

Prince William and Kate Middleton at an event

“A few people noticed because it’s a pretty unusual thing to do.

She’d deliberately gone outside to take the call because she didn’t want to be overheard.

Kate was walking up and down and looking upset as if she was having an argument.

Prince William and Kate Middleton smiling.

But she didn’t cry.

Word went round that it was William and they were having problems,” the source explained.

After Kate was finished with the phone call, she reportedly took the rest of the day off.

“We didn’t think anything about it at the time.

But looking back, the call was definitely a girlfriend-boyfriend tiff,” said the insider.

Of course, the rest is history.