Phony: (Adjective) Not genuine; fraudulent.

Madonna had her BFF 4EVA Britney Spears join her onstage for the L.A. stop of her "Sticky and Gross" tour at Dodger's Stadium last night.

Clad in a white tuxedo-style shirt and black wide-leg trousers, Spears walked on stage -- to thunderous applause -- at the end of Madonna's tune "Human Nature," singing the last verse. Pointing to Spears, Madonna then yelled, "She's not your bitch!"

Although Spears didn't dance, Madonna spun around her, hugged her and kissed her hand. (Source)

Yeah! Britney Spears isn't our bitch! She's Madonna's bitch. Everyone knows that. That's why whenever Madonna feels like she's slipping into irrelevancy she calls on her to do her bidding. And you know, because Britney Spears is just like a big, dumb Golden Retriever, she does whatever Madonna tells her to. I guess you could say it's kind of a symbiotic relationship... Except Britney doesn't really get anything out of it and Madonna is totally just using her.