Sofia performed the routine on camera for her boyfriend Scott Disick. "She told Lionel [Richie]", the source continued "He said he is going to cut her off and write her out of his will if she continues her relationship with Scott as he thinks he's extremely toxic for her".
The break-up is believed to have occurred after Scott was spotted cuddling up to a mystery woman earlier this week in Jackson Hole, Wyoming, just days after the couple returned home from a romantic vacation to celebrate Scott's 35th birthday.
The insider revealed that Richie's dad Lionel strongly supported the split, saying: 'Sofia was fed up and heavily influenced by friends and family, especially Lionel, to break it off'.More news: New Italian govt vows to create jobs, deport migrants
"When Scott drinks, he is a sloppy mess and fools around".
According to US Weekly, Sofia dumped Scott after reportedly discovering he had been unfaithful.
"He isn't really taking it seriously".More news: IPhone battery health menu first look
There had been rumours that Scott and Sofia were on shaky ground since back in November.
"Sofia has shown over and over again that she is willing to stay with Scott even when things are not great - but Scott is doing well lately. They seem really happy", a source said of the couple before their split.
Scott is a father-of-three from his nine-year relationship with ex Kourtney Kardashian, named Mason, eight, Penelope, five, and Reign, three.More news: Partners Launch First Autonomous Solid-State LiDAR Logistics Vehicle