"They've certainly cleaned up their act for the children's sake, but they can still make each other double over laughing."

According to Hello!, Chef Darren Watson said he learned from his research that Princess Kate's favorite sweet treat is sticky toffee pudding, which Prince William verified and said, "Very good." Kate's favorite dessert is a timeless classic—a traditional British treat that can be relatively easy to make.

Kate Middleton's iconic engagement ring, originally owned by Princess Diana, has not been a common feature during her public outings this year.