Carlos Pena, Kendall Schmidt, Logan Henderson and James Maslow pose for a group shot as they arrive at the official red carpet for the 2011 Worldwide Day of Play held at the Ellipse on Saturday afternoon (September 24) in Washington, D.C.

The guys joined channel mates Victoria Justice, Jennette McCurdy and Keke Palmer, among many others, at Nickelodeon’s largest ever day of play event.

After their concert — where they performed several of their hits like “The City is Ours,” Big Time Rush hung out backstage with NBA Players LeBron James and Dwyane Wade and their families.

45+ pics inside…