You might know who Victoria Beckham and Emma Bunton are, but did you know they used to be in one of the biggest British girl bands of all time, called the Spice Girls?
No? Well, you'll be hearing all about them soon as they've announced a massive world tour that kicks off in December.
The Spice Girls were famous for promoting 'girl power' and, in the mid 1990s, became one of the most successful pop groups of all time.
They sold about 55 million albums worldwide and had nine number one hits in the UK alone.
All the girls had their own nicknames. Emma was Baby, Victoria was Posh, Geri Halliwell was Ginger, Mel B was Scary and Mel C was Sporty, because she always wore sports gear.
They were so famous, they got to meet all sorts of celebs and dignitaries like Prince Charles and the former South African president Nelson Mandela.
Fans went crazy for anything Spice-related and the girls earned loads of money lending their name to all sorts of merchandise.
They had their own wax works - and released their own film - Spiceworld: The Movie.
They even had toy dolls made of themselves.
But in 1998, Geri decided she'd had enough and quit the band. Shortly after the others also called it a day to launch their own solo careers, with mixed success.
Victoria is the only Spice Girl who hasn't had a solo number one. She's more famous for her marriage to David Beckham. Look how different the couple looked in 1997!
Fans went mad when they heard the girls were reuniting. One London concert sold out in 38 seconds!
They started off their concerts in Canada and here they've just arrived in the UK. And if you can't tell who they are now - from left - Ginger, Sporty, Baby, Scary and Posh.