Trey Songz isn't the type of guy to leave his shirt on. The R&B crooner flexed his abs, pecs and biceps for the crowd at Power 105.1's annual Powerhouse concert, held at Barlcays Cent on Saturday (Nov. 2) night. Songz also took an acapella stab at August Alsina's "I Luv This Shit," the remix for which he and fellow R&B crooner Chris Brown laid down recently. Songz kept things X-rated, rap-crooning "Ima keep on smoking cause I luv this shit / And I’ma keep on grindin cause I luv this shit..." and you know how the rest goes. Songz then turned up for his Chapter V single "2 Reasons." Watch above.