Madonna didn't wait for a sold-out arena to launch her new era ... she took over Times Square instead -- delivering a surprise performance that stopped tourists and commuters ...

M.I.A. says Kid Cudi didn't have the guts to fire her directly ... claiming she found out she'd been dumped from his tour when her son called from school and told her she ...

Latto says her new song is about Cardi B calling her a "p***y ass" ... but she says her response isn't exactly a diss ... and it sounds like she might be down to mend fences. ...