Hot Chicago sightings include Ciara, Bill Bellamy, Twista and Barry Switzer

Ciara at Lumen for Hennessey V.S. party

SEEN ON THE SCENE: Singer and actress Ciara charmed the fans while hosting the big Hennessy V.S. bash at Lumen the other night. … Funnyman Bill Bellamy was spotted parting at Hub 51’s lower-level Sub 51 nightspot — surprising everyone by grabbing the mic and emceeing the night. … Speaking of surprises, Twista hopped on stage for an unplanned set at Studio Paris — much to the delight of the Phoenix bandmates, also spied in the crowd. … For the art exhibit featuring Tom O’Gorman and Adam Umbach at LuxBar Thursday night, eatery owner Steve Lombardo greeted a large group of art lovers, including sculptor Richard Hunt, Mamie Walton, Stanley Paul, Rosie O’Neill, Tom Dreesen, newly arrived Irish vice consul Nicholas Michael, RL’s Rich Varnes and Peter Axelsen, Lynn and Jim Kiley and designer Anastasia Chatzka. … Before heading to Detroit for Sunday’s game, the Bears’ Henry Melton dropped by both Sunda and Ay Chiwowa. … Speaking of Sunda, “Transformers” director Michael Bay was back there, before wrapping Chicago filming of the fourth film in his big movie franchise. … While in town to play the Sox, the Royals’ pitcher Jeremy Guthrie dined at Joe’s Stone Crab. … College Hall of Fame coach Barry Switzer was spotted having dinner at Tavern on Rush — causing a huge stir with the Oklahoma fans in the joint.