In fact, she was the only one of the prince’s friends in attendance (perYahoo!).

Penny was married to Norton Knatchbull, the son and heir of the 2nd Countess Mountbatten and Lord Brabourne.

Prince Phillip was Norton’s uncle, andPrince Charleswas the best man at his wedding to Penny in 1979.

Queen Elizabeth

The prince started to invite Penny on carriage rides and eventually taught her how to do it.

“They were brought together by tragedy but were there for each other through thick and thin.

He trusted her implicitly and she adored him.

Penelope Knatchbull

She never betrayed him.

She was a keeper of not only his secrets but those of the entire family.”

Their close relationship, however, sparked rumors that they were more than just friends.

And sources say that Knatchbull also had a close relationship with Queen Elizabeth.

Then, in 2010, the couple split after Norton left his wife for a Bahamian fashion designer.

So it makes sense that Penny was included at the prince’s funeral.

“She looked heartbroken when she arrived at the funeral and she is heartbroken.

She’s lost her best friend,” the source revealed.