Prince William and Kate Middleton have fun with Charles and Camilla

Prince Williams and girlfriend Kate Middleton have reportedly been cozying up to Prince Charles & wife Camilla, after the on/off reportedly spent the weekend at the Queen’s 50,000-acre Balmoral estate.

According to Us Magazine Kate joined 58-year-old Prince Charles on October 13th for rifle practice on the estate grounds, according to an eyewitness: "She was wearing the correct gear for a beginner, all dressed up in winter camouflage, she wasn't firing at any live animals, she was just practicing with targets.”

The onlooker added: "Charles was watching her and offering words of encouragement."

Later, Kate reportedly left Charles to join her 25-year-old boyfriend, Prince William and his friends, who were said-to-be deeper inside the estate, for William's deer-stalking party.

Though there has been recent reports of Kate being an animal "killer," a source close to the royal family told Usmagazine.com, "Kate would not have been expected to shoot any deer. She was merely practicing. She would have joined the hunt, but generally the men tend to take over on these occasions."

A pal of Kate's added: "Kate's not the kind to kill an animal. She's a strong woman and I know she would have politely declined if she was asked to do so."

When asked about the trip, a royal spokesperson gave Us Magazine a clear "no comment," before adding: "What the Royals do on the Balmoral estate is a private matter."