This week Queen Elizabeth II will pass the record set by her great-great-grandmother Queen Victoria who reigned for, by Buckingham Palace's estimation, 23,226 days, 16 hours and 23 minutes.
To celebrate Madame Tussauds have unveiled a new dress for their model of the monarch; a replica of the gown worn by the Queen in 2012 for her official Diamond Jubilee photographs.
Four workers from Tussauds' in-house team spent 150 hours sewing 53,000 Swarovski crystals on to the intricate white and silver lace gown.
The Queen's waxwork also features a blue Order of the Garter sash and star and on its head is a replica of the diamond George IV state Diadem.
Visitors are allowed to touch the Queen's latest wax model, created in 2012, as they pose for selfies, and its popularity means staff are regularly working to keep it looking in the best condition.