Queen Camilla spotted with rarely-seen sister during latest public appearance

Queen Camilla has once again been spotted with her rarely-seen sister during her latest public appearance.

Earlier this week on Tuesday (13 May), Camilla and her husband, King Charles III, attended the Elephant Family Evening of Art and Conservation at Kew Gardens in London.

Joining the pair, amongst a few other royal family members, was Camilla's younger sister, Annabel Elliot, an interior designer and antiques dealer who is also mother to Tory politician Sir Ben Elliot.

Annabel was papped in a few photos from the Elephant Family event - an NGO which was established by Camilla's brother Mark Shand back in 2002, which works in partnership with conservation experts on the ground to tackle the challenges facing Asia's wildlife and the communities that live alongside it.

Now, while Annabel may not have had experienced as much of the spotlight as her Queen Consort sister, she's clearly had no issue sharing her true feelings on her marriage with the King.

Claiming that Camilla is a 'very strong character' who 'sticks to her guns', Annabel explained in a recent exclusive (5 April) with the MailOnline: "It’s quite extraordinary when I look back at how she has coped with everything.

"She is incredibly loyal to people she loves… She is a very straightforward person. You always know where you stand."

Queen Camilla's younger sister, Annabel Elliot, attended the Elephant Family Evening of Art and Conservation at Kew Gardens in London on Tuesday (13 May) (Chris Jackson / Staff / Getty Images)

Annabel also gushed over Camilla’s alleged 'really good sense of humour.'

"They rather like quite a lot of things going wrong," she went on. "Things going wrong on a tour, or something like that.

"My sister is not the best person at controlling her laughter. My father would often have to separate us in church."

And when asked about King Charles and Camilla's relationship, she shared: "They have known each other for a long time, almost their entire lives.

"Theirs, as any marriage should be, is a huge friendship."

Annabel (back left) wore a long white coat with a matching white dress featuring gold motifs (CHRIS JACKSON / Contributor / Getty Images)

Annabel noted that the 'key thing' behind the success of their marriage is down to the fact 'there is not really anything competitive between them.'

"She is not trying to steal his thunder in any way at all," Annabel told the outlet. "He is the King. And she will do her best to support him and be totally loyal to him."

Annabel also noted that Camilla's sense of humour is 'the biggest gift she has given him [Charles]', adding: "It’s been such a bond between them. And even if they argue, they will always laugh."

"Like any of us, they will disagree. Strongly. They both have their different views. And they will have a very good argument," one family friend shared, explaining that the pair disagree about Charles taking time while undergoing cancer treatment.

"I think probably, particularly at the moment considering the King’s health in the last year, the main issue is that she can’t persuade him to take time out," the friend noted.

"She obviously worries about him and his [cancer] treatment. Except for the first couple of months, he’s pretty well worked every day since."