SEEN ON THE SCENE: Superstar Lady Gaga — who has become a popular part-time Chicagoan, thanks to visits with her “Chicago Fire” fiance Taylor Kinney — joined by her mom, Cynthia Germanotta, was front ‘n’ center Tuesday for her Born This Way Foundation’s benefit ride at SoulCycle Chicago. The sold-out fundraiser pulled in more than $50,000 to promote mental health and well-being for the lives of young people. … Fans of that classic TV cop show “CHiPs” will want to know the series’ stars — Erik Estrada and Larry Wilcox — will be on hand for the special screening of two “CHiPs” episodes May 1 at the Hollywood Palms Cinema in Naperville. The two actors will greet fans beginning at 7 p.m., prior to the screening at 8:30 p.m. … Among those seen at the opening of T.J. Jagodowski and David Pasquesi’s new “Undressed” sketch comedy revue at the Mission Theatre in the iO Theatre complex on Kingsbury were Tony winner Deanna Dunagan, Tim Kazurinsky and “Chicago Fire” star Christian Stolte. … Speaking of Mission Theatre, virtually the entire cast of “Chicago Fire” put on its own “pop-up” comedy show Sunday night titled “Garbage Truck 81.” Among those participating were David Eigenberg, Joe Minoso, Yuri Sardarov, Eamonn Walker, Kara Kilmer, Randy Flager and Stolte. … The flashbulbs were popping a-plenty as Sophia Bush walked the red carpet at the Godfrey Hotel for the party celebrating the “Chicago PD” actress’ cover story in the new Michigan Avenue magazine. … Former U.S. senator and vice presidential candidate Joe Lieberman was spied at the Spiaggia Private Events space on Boul Mich. …. While in town for his Chicago Theatre gig, blues guitarist Joe Bonamassa and his band stopped by River Roast’s regular “Blues & Brews Brunch” — enjoying Chicago’s own Smiley Tilmon Band featuring Kate Moss. … It was reality TV really coming to life Tuesday night at the Pump Room as Nicole “Snooki” Polizzi and Jenni “JWoww” Farley slipped into the famed eatery in the Public hotel. Choosing to avoid making too much of a spectacle, the former “Jersey Shore” castmates dined quietly at the back of the restaurant on fried chicken, Caesar salad and cheesecake for dessert.