Attention royal watchers. Prince George turns 3 tomorrow and that's likely to mean new pictures of His Royal Cuteness.

Prince George Alexander Louis of Cambridge was born at St Mary's Hospital's private maternity unit, the Lindo Wing, at 4.24pm on July 22, 2013, weighing 3.8kg.

Appearances of the third in line to the throne are relatively rare and new photographs have always created a buzz since he made his public debut in the arms of Catherine, the Duchess of Cambridge, the day after he was born.

Most recently he was photographed wearing earmuffs against the roar of aircraft as he visited the Royal International Air Tattoo in Gloucestershire with his parents.

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The prince is known for his boundless energy and charm and the Duchess described him as "a really lovely little boy".

Details of how he will celebrate his birthday or of any new photos are yet to be made public.

- AAP