The 'Super Duper Love' singer had to be on her "best behaviour" while attending the nuptials of Prince William and Kate Middleton in Westminster Abbey, but gladly let her hair down after the ceremony's conclusion.
"I had a lovely time. It was chilly in [Westminster Abbey], but it was good," she told E! "I just went in, sat down, tried to be on my best behaviour. I was very happy to be there. It was like being part of a fairytale.
"I had a really weird lunch with lovely people, but I didn't know any of them. So, after the church I ended up getting totally rat-arsed with like ten people I'd never met before in my whole life. It was brilliant."
Other celebrities who attended the royal wedding included Elton John, Tara Palmer-Tomkinson and the Beckhams.
Stone yesterday described a recent plot to rob and kill her as a "crazy" idea.