Celeb sightings: Bob Seger, Adrian Grenier, William H. Macy

SEEN ON THE SCENE: After their show, Bob Seger and his band closed down the Pump Room’s bar at the Public Hotel. They were having such a good time, they “booooed” when they heard “Last call!” … The Bulls’ Pau Gasol was spied dining at Jake Melnick’s Corner Tap the other night — sitting at a high-top table in the Game Room with a group of pals. … “Entourage” star Adrian Grenier and his own personal entourage were spotted partying at Untitled. … To celebrate his new, six-year, $155 million deal with the Cubs, star pitcher Jon Lester was joined by family and friends at Giordano’s Gold Coast pizzeria on Rush. … “Shameless” star William H. Macy was feted at the launch party at Hubbard Inn for the new issue of Michigan Avenue magazine, which features the actor on the cover. Macy talked about his directorial debut with “Rudderless,” saying it had made him fall in love with show business all over again. … Max Sound’s Jimmy Place was seen hosting an early Christmas dinner for singer Chris Isaak and his band at Volare restaurant Saturday night — prior to Isaak’s House of Blues gig Sunday.