An old postage stamp of Prince Charles and Princess Diana has been causing a bit of a stir on twitter this week.

Twitter user Philip Cohen tweeted a photo of the stamp, from 1981, along with the fact: "They were the same height”

Princess Diana is said to have been around 5’10 and Prince Charles around 5’9.

People had a few ideas of what went on behind the stamp:

Although, someone did point out: