Ironically, despite her new single's girl power theme, J.Lo got heat for the song -- which was actually written by singer Meghan Trainor -- because of the involvement of Dr. Luke
, who co-produced the track. Dr. Luke, whose real name is Lukasz Gottwald, has been involved in an ongoing legal battle with Kesha, who accused the former of drugging and raping her
. Dr. Luke has called Kesha's claims "outright lies."