Star sightings: Aaron Carter, Carnie Wilson, Ashton Kutcher, Scottie Pippen

PHOTO FLASH: Top Chicago photographer Linda Matlow got a kick out shooting singer Aaron Carter — when he was in town for Northalsted Market Days. During the photo session at the Twisted Vine eatery on Halsted, prior to his performance, Carter played the piano and serenaded Matlow with Stevie Wonder’s “Isn’t She Lovely.”

Quipped Matlow, “Not quite as special as my luv singing ‘Happy Birthday’ to me last month — but priceless!”

SEEN ON THE SCENE: While in town for the Northalsted Market Days festival, Carnie Wilson made the scene at the Kit Kat Lounge and Supper Club’s “Divalicious” weekend brunch. … Comedian and “Chelsea Lately” regular Sarah Colonna was spotted Sunday brunching at Hub 51. … Bill Murray fans loved seeing him at Paris Club. … Lovebirds Ashton Kutcher and Mila Kunis were spied at Japonais — looking very cozy! … Earlier Saturday the coosome twosome spent several hours with pals at Citizen, where they cocktailed and noshed and totally charmed the staff by their down-to-earth genuineness and good manners. … Recent sightings at Mercadito have included the Dallas Maverick’s Shawn Marion and (separately) ex-Bulls great Scottie Pippen and a group of buddies. … Veteran sportscaster Chet Coppock was spotted lunching Monday at O’Brien’s restaurant in Old Town.