Star Wars took over Leicester Square in London on Monday, to celebrate the final new film in the space saga.
Giant video screens showed clips from the films throughout the day - look out for this giant Tusken Raider!
The Royal Philharmonic Orchestra played music from the Star Wars films, including the famous theme by composer John Williams.
And just in case they weren't feeling safe, Stormtroopers from the 501st UK garrison were there to keep order.
We know it's tough to park in London sometimes, but leaving an X-Wing in the middle of Leicester Square is just lazy!
Lots of fans spent the day in Star Wars costumes.
This is what the thousands of fans are getting excited about - Star Wars Episode III: Revenge of the Sith.
But not everyone was pleased to see the costumed fans. Newsround's Adam looks like he's in lots of trouble with these Stormtroopers.