Lindsay Lohan is “heartbroken” over her split with Sam Ronson – but the DJ is piling on the misery by making fun of her at a club, according to reports.

A friend close to the couple told People.com: “Lindsay, despite appearances, is insecure and has relied on Samantha and their relationship to build her up. Lindsay barely sleeps, which explains a lot of her behaviour. She’s exhausted. She can’t even sit down for a minute without pacing around the room. It’s really sad.”

According to the source, Ronson and Lohan are still talking and “Sam has begged Lindsay to get help”.

But a report by Radar Online on Ronson’s latest DJing performance, at Slide in San Francisco, claimed that she gave a shout out to Lohan before singing: “Na na na na, hey, hey, goodbye.”