published: 2012-09-19 08:52:49 Tomorrow night's episode of Glee will once again feature a tribute to Britney Spears. One of the clips we have to show you from "Britney 2.0" gives us a look at a very energetic performance of one of Spears' songs. We also have a look at what Rachel's dealing with. We got a glimpse of the "Hold it Against Me" performance in the promos we shared yesterday . And now we can show you the full performance, which has Brittany taking the lead and backed up by the rest of the Cheerios. Does it seem like Kitty is trying to nudge her way into the lead? Are Brittany and Kitty going to be rivals? Kitty strikes me as the type not to care about seniority. I could see her trying to bully her way to the top of the pyramid among the Cheerios. Meanwhile, in New York, Rachel has her own opinionated blonde to contend with. In this clip, it looks like Cassandra July is once again trying to hold Rachel back. It's tango time and guess ...