Cheesy. Corny. Fantastic. We're totally in love with Blaine and Artie's "Boys"/"Boyfriend" mashup. Justin Bieber ftw! Here's the full performance from Season 4, Episode 2: "Britney 2.0." Original airdate: Thursday, September 20, 2012 at 9pm on FOX Can’t get enough Gleetastic goodness? Like us on Facebook or follow us on Twitter!