When Lily sings lines like "Don't need to shake my ass for you, cos I've got a brain" or "I'll take my clothes off, and it will be shameless, cause everyone knows it's how you get famous" etc. she's talking about
self worth.
She's saying she can be sexy if she
wants too, dance if she wants to, dress like a complete **** if she wants too, but it's if she WANTS too. She will not do these things because she feels pressured to do so.
She's saying she can "shake her ass" but because the industry see singers as cash machines, she's reminding them she doesn't have to "shake her ass" for
them, because she's human like everyone else, and has a brain and isn't an object. Because she can, doesn't mean people will make her.
I mean I know it's a little more indepth than standard pop music, but surely it's not hard to understand sarcasm and context
The INMIY hair. 
for trying.
