Zara Phillips was the first of the royals to arrive today for a sneak preview of the Chelsea Flower Show today ahead of tomorrow's grand opening. The young royal had a look at the world famous show which other members of the royal family - including the Queen - are expected to view this week. As the event celebrates its centenary this year, Zara, wearing white jeans, a black jacket and heeled ankle boots, was happy to cut a cake to mark the occasion. Scroll down for video Getting the party started: Zara Phillips cuts the cake as the Chelsea Flower show celebrates its 100th birthday More birthdays: Zara Philips sits on a lawnmower to celebrate 50 years of John Deere, and right, beauty: A Papaver commutatum Ladybird plant Right at home: The outdoorsy Royal looked at ease atop the mower Pampas yourself: A women wearing a dress of fresh flowers designed by Zita Elze poses for photographers in the M&A Centenary Garden Gnome fever takes