Prince William "Looks After" Princess Kate With an Adorable Gesture Once the Kids Are Asleep

When they're not carrying out official royal duties, Princess Kate and Prince William live relatively private lives. And according to a source, Prince William and Kate Middleton have a sweet nighttime routine once their kids are asleep.

The Prince and Princess of Wales have been married since April 29, 2011, and they've welcomed three children since then—Prince George, Princess Charlotte, and Prince Louis.

In an adorable move, Prince William reportedly dotes on his wife by bringing her an alcoholic drink once their children have gone to bed each night.

"William will bring Kate a gin and tonic," a royal insider claimed, via the Daily Record. "They look after each other, but in different ways."

In March, Princess Kate shared her cancer diagnosis with the world. She understandably retreated from her public royal role while she underwent chemotherapy.

In an interview with Us Weekly earlier this year, royal expert Robert Jobson shared that William was "completely crestfallen" when his wife was diagnosed with cancer.

Jobson continued, "It was devastating for him."

On September 9, Princess Kate shared an emotional video on Instagram revealing that she'd completed her chemotherapy treatment.

"The last nine months have been incredibly tough for us as a family," she wrote in the caption. "Life as you know it can change in an instant and we have had to find a way to navigate the stormy waters and road unknown."

Princess Kate continued, "The cancer journey is complex, scary and unpredictable for everyone, especially those closest to you."

"With humility, it also brings you face to face with your own vulnerabilities in a way you have never considered before, and with that, a new perspective on everything," the Princess of Wales wrote.

"This time has above all reminded William and me to reflect and be grateful for the simple yet important things in life, which so many of us often take for granted," Kate explained. "Of simply loving and being loved."