The 30-year-old hit back at Instagram and Twitter trolls who commented on her six-month-old baby Sophia.
TAMARA ECCLESTONE'S EX BOYFRIEND ARRESTED OVER CLAIMS HE STOLE JEWELLREY FROM HER
She told The Sun: "I posted a picture of Sophia on Instagram when she was three-months-old and someone wrote a really mean comment saying that she was overweight.
"She is purely breastfed and was just thriving. I went mental. Do not f*** with my child, or I will kill you."
The Formula 1 heiress also rubbished claims that she always looks glamorous, insisting she is just like every other mum.
She said: "People always think I'm glommed up because they see pictures of me at parties, but once I'm home, I'm straight into my tracksuit and putting on spot cream."
Tamara also admitted she and husband Jay Rutland don't use a nanny, adding: "I'm a completely hands-on mum. Sophia is my proudest achievement."
TAMARA ECCLESTONE AND JAY RUTLAND ANNOUNCE THEY'RE EXPECTING THEIR FIRST CHILD!
Speaking of Jay – who she confessed to making sign a pre-nuptial agreement when they wed – she said: "As long as I have my husband, baby and family, I'm happy. Money can't buy you that."
Tamara, Jay and Sophia will soon star in a new reality show Seven Days With…, which will follow their glamorous lives for a week.