Queen celebrates record reign
9 September 2015 Last updated at 07:29 BST
The Queen has become the longest reigning monarch in British history.
She has now beaten Queen Victoria's record of 63 years, seven months and two days.
Her Majesty was just 25 when she first took the throne back in 1952 and lots has changed since then.
Watch Jenny's report to find out more about the Queen's reign through the ages.