On Saturday, Sept. 24, Nickelodeon hosted it's Worldwide Day of Play in Washington D.C. Not only did plenty of Nick stars like Victoria Justice attend the event, there were plenty of other celebrities that came out to join in on the fun. In addition to partaking in some recreational activities and wacky games on the colorful field, Nick fans were also entertained with a performance from Big Time Rush.

In these pictures from Nickelodeon's Worldwide Day of Play, Victoria Justice partook in some games, including channeling her inner hamster as she ran around in a giant inflatable ball. She also took in some tennis with NBA pros LeBron James and Chris Paul, and posed in front of a giant ball pit with her Nick co-star. The 'Victorious' starlet also met the First Lady, who was there to join in the activities and to film a short PSA ad, most likely for her Let's Move! campaign to fight childhood obesity. Big Time Rush also performed hits like 'This City Is Ours' for thousands of screaming fans, dancing onstage and later going down into the crowd to high five some admirers.

Check out these pictures from Nickelodeon's Worldwide Day of Play, and let us know if you missed all of your favorite Nick shows when they went off the air for three hours to celebrate the day of fun-filled activities.

Watch Big Time Rush Perform 'This City Is Ours'