Two pictures never seen before of the Queen have been released as celebrations to mark her 90th birthday continue.

One of the images shows the young Princess Elizabeth ready to swim with her father King George VI.

The second shows her looking at a bird while it rests on her arm.

The photos, from archive footage, are not dated.

Queen rare archive footage

Princess Elizabeth with her father King George VI

They have been released ahead of a gala show on Sunday, which will look back on the Queen’s reign, featuring celebrities including Gary Barlow and Kylie Minogue.

The Queen’s early years, teenage life, Second World War and the present day will be represented in the show, which will be held in the grounds of Windsor Castle.

More than 1,500 performers will entertain the audience, including singers Katherine Jenkins, Dame Shirley Bassey and actress Dame Helen Mirren.

Around 900 animals will also take part.