Making The Band 3

theyve been playing the episodes all day and theres this one episode and one of the girls talks about preserving sexy or whateverr and then theyre in this room, and theres a song playing and ive been trying to figure out what the song is all day, so if someone can help me that;d be greattt.
the lyrics i remember are:
"tonights the night i party like a rockstar"

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they play the song about 1 minute into the episode. i just need the name/artist