Even today, when the occasion doesn’t have any legal significance, most people want to make a big deal of their 21st birthday. For those with fame and fortune, it seems a ceremonial “key to the door” and a bottle of champagne aren’t enough in the way of 21st birthday gifts: they want wild parties with glitz and glamour.

None more so than Pirates of the Caribbean star Keira Knightly – She held a 1920s themed party where 150 guests each got a bottle of Dom Perignon champagne and a selection of caviar – let’s just hope none of them skimped on her 21st birthday gifts! The bubbly wasn’t all that was on offer: it’s reported the tequila was flowing freely, which may explain why Keira left early the next morning wearing a pig mask.

Basketball superstar Lebron James actually managed to top Keira’s bash, arriving in a black Rolls Royce at a private dinner for 65 close friends. He then held a party for a thousand guests who each paid up to £150 to attend, with the proceeds going to charity. And you can’t accuse Lebron of being a soft touch: being born on 30 December, he warned guests not to pass off Christmas gifts among his 21st birthday gifts.