Aerosmith’s Steven Tyler caused a huge commotion at the Darby after playing Madison Square Garden on Tuesday. We’re told Tyler invited the crowd during the concert to join the band later at the club, only to have the bouncer confirm the rocker was inside before turning disappointed fans away at the door. At the hot spot, Tyler was swarmed by beautiful women. “Steven was in front of the DJ booth, and was dancing and requesting Mick Boogie put on songs by Rihanna and the Rolling Stones,” says a spy. “He was surrounded by models.” Another source tells us, “There were girls at his table and all around him,” adding, “He was taking pictures with people, but it looked like he was being friendly, not flirty.” Page Six previously reported that Tyler’s relationship with fiancée Erin Brady has been rocky, though reps for Aerosmith deny they have split, telling us: “Just as any couple goes through trials and tribulations in a relationship, Steven and Erin are asking for their privacy at this time.”