Spotlight set to shine on royal sibling

After 21 blissful months of one-on-one care, world media attention and carefree splashing in the Buckingham Palace pool, Prince George is facing a spot of upheaval in his gilded life - a sibling.

Later this month, the royal toddler's mother is expected to give birth to a brother or sister who will be fourth in line to the throne.

In his latest official photos, the son of Prince William and his wife, Kate, appears confident and curious - a blond tot with an impish smile.