TV star and musician Myleene, who has just returned from a holiday in Mexico, issued a strongly-worded warning to the thug following the shocking incident.
Although she has not elaborated on the exact details, apparently Myleene's pensioner mum Magdalena and younger sister Jessie, 33, were knocked to the ground when the mugger stole their bags.
Last night, 35-year-old Myleene tweeted: "To the person who mugged my 67-year-old mum and my sister. I hope you get hit by a bus and die. Slowly."
Myleene's celebrity pals were quick to respond, offering messages of support to the Klass family.
Former Spice Girl Emma Bunton said: "Oh my god, disgusting! Please give them a cuddle from me."
Ex-EastEnders actress added: "I'm so sorry. Let me know if you find the toe rag and I will send the boys round... #disgusting."
TV presenter Kate Thornton also asked: "Is your mum ok? So sorry to hear that x"
This morning (10 January), Myleene was spotted out and about near her Essex home and, unsurprisingly, didn't have her usual spring in her step.