Kate Middleton and Prince William have three children together.

Royal fans often wonder if the couple will have another child.

Kate Middleton has joked that Prince William would "kill" her if she had another baby.

A royal expert confirmed that the Princess of Wales has expressed similar sentiments.

Fans have reacted with sweet comments.

Some hope the couple will have another child, while others don't think it's likely.

One fan thinks a fourth child would require a bigger living space.

Another fan would have loved to see the couple have twins.

The royal couple's family plans continue to be a topic of interest for fans.