That's just from azlyrics, which is user submitted. They don't exactly pay attention to punctuation. Where she says "Britney bitch" is from her song Gimme More and it should have a comma. In the original song she says "It's Britney, bitch." The song is about the paparazzi's obsession with her. She's addressing them. Scream and Shout is heavily edited, and they cut that part in the song because it's fairly iconic for Britney at this point.
She's not calling herself a bitch.
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