First we couldn't get enough of this other English-Irish boy band's first big hit "Glad You Came." Then their E! reality series cracked us up. But what we really love about these guys -- (from left) Jay McGuiness, 22; Max George, 24; Nathan Sykes, 20; Tom Parker, 24; and Siva Kaneswaran, 24 -- is how they refreshingly never hold back. After encountering Christina Aguilera on the set of "The Voice" in 2012, they told a radio station what they thought of the diva. "She's a total b----," Tom told a radio station. "She just sat there and didn't speak to us. Wouldn't even look at us." Bandmate Max George is equally unapologetic about having slept with fans and isn't embarrassed by his recent fling with Lindsay Lohan, telling Bravo host Andy Cohen that she's still his celebrity crush. "If she's watching from rehab," he said, "then it'll cheer her up a little bit."