While the real Lady Gaga entertained the crowd in New York as part of “New Year’s Rockin’ Eve,’’ the band Porctopus performed as Lady Ska-Ga at the Middle East Upstairs. Ska-Ga, which was fronted by Porctopus’s Kaylee Tilton, got the crowd dancing with upbeat hits such as “Bad Romance,’’ “You and I,’’ and “Paparazzi’’ before giving the stage over to the Timberfakes, Boston’s own Justin Timberlake cover band, led by Ryan Kelley. Despite being Justin-focused, the ’Fakes’ first song of 2012 was Will Smith’s “Gettin’ Jiggy Wit It.’’ . . . Over at Strega Waterfront, singer Stevie B - known for the 1990 hit “Because I Love You (The Postman Song)’’ - entertained a crowd that included Celtics significant others Mesha O’Neal (Jermaine’s wife) and Ashley Bachelor (Rajon Rondo’s partner). Stevie B, whose real name is Steven Bernard Hill, was arrested in Springfield in September and charged with failing to pay about $420,000 in child support. He’s due in court in February.