The 47-year-old told her followers her mum, Anna, had died suddenly three weeks ago and paid tribute to her online.
Posting a picture of her mum smiling into the camera on Instagram, Tamzin wrote: “R.I.P Anna Patricia Santi.
“So lucky to have you as my mum. What an incredible human you were.
“Thank you Mum. You taught me how to live and you continue to teach me …”
In another picture, which showed her two siblings, she called Anna the “best mum”.
Earlier this year Tamzin said her mum, who worked as a city stockbroker before she was born, was her inspiration.
She explained how she would encourage her to take every opportunity she could – something Tamzin now tells her two daughters, Marnie and Florence.
Tamzin, 47, told The Daily Mail: “If there’s one thing I’ve learned, it’s that life is easier if you give things a positive spin. I don’t constantly view the world through rose-tinted spectacles — but I do think a person who feels lucky is bound to be happier than someone who constantly feels hard-done-by or lives in a cloud of negative feelings.
“My mother, Anna, used to drum that into me when I was a child. She would say I was a lucky girl to be given such amazing opportunities, including going to the Sylvia Young Theatre School in London.
“So I do the same to my girls.”
Mel has been a single mum since she divorced husband Tom Ellis in 2014 after he had an affair while working in America.
The Sun exclusively revealed how Tamzin would make a shock return to EastEnders reprising her role as Mel Owen in October 2017.
Fans were delighted and since her comeback, she's been embroiled in some of the soaps grittiest storylines.
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