Numbers show Prince Louis stole the show at Princess Kate's event

Kate Middleton was joined by her husband, Prince William, and the couple's three children—Prince George, Princess Charlotte and Prince Louis— when she hosted her annual Christmas carol service on Friday.

The Prince and Princess of Wales were pictured arriving at the service with their children. 

After the service, Kensington Palace's social media team shared at least three Instagram post featuring pictures from the event on the official account of the Prince and Princess of Wales.

Notably, the Instagram post with a cover image featuring Prince Louis has emerged the most engaged post with at least half a million likes on it.

In the thumbnail photo of the carousel post, Prince Louis and his mother are seen holding candles during the service.

Princess Kate hosted an annual Christmas carol concert at Westminster Abbey on  to honour guests who had mostly been invited for service to the community.

The event, which the princess launched, is now in its fifth year, offering the royal family a chance to thank people across Britain for volunteering, raising funds for charity and supporting the vulnerable.

Kate last year completed a course of preventative chemotherapy to address an unspecified form of cancer. 

She gave each guest a note highlighting how a "moment of listening" and "word of comfort" can make a difference to people's lives.