'Glee' Britney Spears episode: Harry Shum did a 'double pack' with .

There might simply be one Britney Spears, but "Glee" star Harry Shum, Jr. mistook his co-star Heather Morris for the very thing."I'm actually really happy for Heather Morris because this is her breakout episode," Shum tells Zap2it about the "Britney/Brittany" episode airing Tuesday, Sept. 28, in which Cheerios Brittany (Morris) gets gassed at the dentist and imagines herself as Spears in music videos.

People are leaving to go nuts when they see her do her thing," he continues. "She looks like Britney in the musical numbers. It's crazy. You get to do a double take. Me and Kevin [McHale] walked into her doing a musical number because some of them we weren't in that she was in. We had heard that Britney was approaching on set, so we were like, 'Wait, is that her?' We had to feel very close to see it wasn't."We've already seen Morris in her "Me Against the Music" outfit, and the latest "Glee" photo shows her dressed as Spears at the MTV Video Music Awards in the skimpy green outfit, complete with a snake as an accessory."I'm in some Britney numbers," reveals Shum. "It's insane, if you saw in the previews. They made it seem like Britney music videos."Shum, who's 28, was particularly psyched to do this episode because of the nostalgia and familiarity involved with the song list.He explains, "You know, some songs on 'Glee' you sort of have heard of but we don't actually love the lyrics, so it was actually fun to do these songs and not yet have to look a the lyrics sheet and be capable to live all the songs by heart. It's peculiar because back in high school when her songs came out, whether you hated her or loved her, you knew her songs by heart. So that was actually fun.He falls into the fan category and readily shares his favorite Spears song: "I love 'Toxic.' I believe it's a large song."Check back with Zap2it for more Harry Shum talking about his love triangle, his dancing and of course his abs. Follow Zap2it and Zap2itHanh on Twitter andZap2iton Facebook for the latest movies, TV and celeb news.Photo credit: FOX

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