Mark your calendars: the 2012 Summer Olympics kicks off this Friday, July 27th! While we wait, we’re rounding up fun facts about the London games, from the performers (the Spice Girls are reuniting!), to celebrities in the stands (Prince William and Kate Middleton are making their first Olympics appearance this week!) Plus, find out how much those gold, silver, and bronze medals are really worth. Click through the gallery to get the inside scoop on the closing ceremony’s supermodel moment, the athletes to watch, and more.