"You care about values, doing the right thing, and championing the causes that will shape your future", he complimented them.
Taking inspiration from Meghan, he said: 'As my wife often reminds me with one of her favourite quotes by Martin Luther King Jr, "Hate cannot drive out hate; only love can do that"'. Watch the sweet video below!
Markle, Prince Harry, Middleton and Prince William had their first joint engagement of the year at Prince Charles's 50th Investiture Anniversary celebration at Buckingham Palace on Tuesday, and it's the first time since Christmas that the Fab Four were reunited publicly. Other guests included those representing the charitable organisations Charles has supported over the decades.
Inspired The couple applaud delegates
Markle, meanwhile, looked gorgeous in a gold and silver brocade dress which featured foil floral print.
She carried a pale pink clutch in her hands and wore suede stiletto heels in the same shade, while she swept her glossy dark hair back into a chic chignon.
Kate was a vision of refined elegance, dressed in a long, mint-green dress which featured a high neckline and a pleated skirt. She joined him briefly as he gave a speech to the mainly young people in the audience, as he stood with his arm around his wife.
Dressed casually but smart in black pants with a matching black top, black high heel stilettos and a navy blue blazer, she is due to give birth to the couple's first child next month.
During his rousing speech, for the global initiative which aims to encourage young people to take part in positive social change, Harry spoke about ambition, mental health and climate change.