Britney is the easy answer, but it's also Rihanna. Not only does she have no say in terms of creative direction or the recording process, it's proven she can barely sing/can't dance, & she can't even speak simple English during interviews.
Gaga has also proven she's nothing without a team manufacturing everything about her.
she may be a mess but people like Katy wish they had an ounce of her talent. 
