Sources directly connected to Ke$ha tell us it all started when the singer's "Get Sleazy" tour ended in 2011. She says [her producer Dr. Luke] started ragging on her over the extra lbs she had gained in her downtime. Ke$ha says Luke began calling Ke$ha fat and urged her management team to do something about it.

Our sources say Ke$ha complained during a music video shoot in 2012 Luke told her she "looks like a fucking refrigerator" and the singer was profoundly affected by it.