Importance of wedding cake

The wedding cake Alex and Henry destroy at Phillip's wedding symbolizes the elegance and opulence of the Royal Family, along with the decorum that involves being a part of the family. Phillip is someone who tries his best to live up to the expectations of the royal life and embraces the lifestyle, including having a wedding with a $75000 cake. However, Alex and Henry are not people who fit into traditional expectations, and their destruction of the cake foreshadows how they defy the expectations forced upon them, particularly Henry.