Joanna Lumley joined celebrities such as Helen Mirren, Jamie Oliver and Maureen Lipman to take a look as the show celebrates its 100 year-old birthday.

The Queen has already visited, along with members of the royal family, including Prince Harry who showed his grandmother a garden that is close to his heart.

The show is open to the public until Saturday. Catch the highlights presented by Alan Titchmarsh and Joe Swift all week long.

To see Gold medal winner Adam Frost talking to Mary Berry, Ruth Langsford, Lynda Bellingham and Arlene Phillips about his award winning Alzheimer’s society garden, click here

The Chelsea Flower Show 2013 is on BBC1 12.30pm and BBC2 at 8pm up until Saturday