In two official images released to mark Charles's milestone, the heir to the throne is pictured sat on a bench with his grandson and seated beside them are the Duchess of Cornwall and Princess Charlotte.
The photos were taken by photographer Chris Jackson in the garden of Clarence House, and feature Prince Charles, the Duchess of Cornwall, the Duke and Duchess of Sussex, the Duke and Duchess of Cambridge and their three children.
The guest list is likely to include Charles's friends from his public and private life, members of the royal family and others who have played an important role in the prince's career.
The adorable photographs were taken in the garden of Clarence House to celebrate the Prince of Wales' 70th birthday.
Harry, The Duke of Sussex - who is now expecting his first child with Meghan Markle - received 77 percent of the public vote.More news: Nick Chubb breaks away for a 92-yard touchdown vs. Falcons
More news: Morrissey 'punched in the head' on stage during gig
More news: Trump Defends Missing WWI Memorial Ceremony
Fans of the British Royal Family have been eagerly awaiting new pics of Prince Louis, as Prince William and Kate Middleton's seven-month-old son hasn't been seen since his since his July christening. In contrast, the second shot is more natural and shows the family laughing and looking more relaxed.
Blue and white is the theme of the portrait, as everyone is perfectly color coordinated.
William and Harry both opt for a smart-casual look, donning suits without ties, while their father stands out in a blue striped suit and light blue tie.
The handsome snaps were taken especially for Prince Charles' birthday and were shared on social media on Wednesday morning with plenty of fans quickly commenting on how wonderful it is to see the family's special moment together.
During Prince, Son, Heir: Charles at 70 a sneak peek of another photo taken at the same time appeared of Charles, Kate and Louis.