Terms of release, which must be included and passed-on to anyone to whom this image is supplied: USE AFTER 10/10/2015 must be cleared by Art Partner. This photograph is for editorial use only. NO commercial use. NO use in calendars, books or supplements. Use on a cover, or for any other purpose, will require approval from Art Partner and the Kensington Palace Press Office. There is no charge for the supply, release or publication of this official photograph. This photograph must not be digitally enhanced, manipulated or modified and must be used substantially uncropped. Picture must be credited: copyright Mario Testino /Art Partner. File photo dated 05/07/15 of the Duke of Cambridge and his son, Prince George who will celebrate his second birthday tomorrow.