Tamara Ecclestone hasn't said a word to her ex-boyfriend since he sent a sex tape to her dad's office.

The heiress and her family were devastated when Omar Khyami had X-rated footage delivered to her father Bernie Ecclestone in July, but the brunette beauty admits she would have ''never in a million years'' imagined the stockbroker could do such a thing.

Recalling what she did after watching the tape with Bernie and her mother, former Armani model Slavica Ecclestone, she said: ''I called my sister, Petra, who came to dad's office and, when she arrived, we were all crying. My dad was as white as a sheet - he's not really an emotional man but I could see how much it had affected him.

''I called Omar in the car on the way to my sister's house. At first he tried to deny it, then he sort

of admitted it and I told him it was over. I was so hurt. I would never in a million years have believed

he'd do that to me. From that day on, I knew I was never going to speak to him again. It was not an option to take him back.''

The 28-year-old socialite was left ''mortified'' when she watched the footage with her parents and admits it was particularly ''traumatising'' watching a sex tape with her 82-year-old father.

She added to new! magazine: ''A newspaper showed it to my dad and he called me into his office. I had no idea what I was going in there for - my dad's usually so busy in the day. I knew it was something serious. I was just hoping there wasn't some really bad news like my dad was ill.

''When I got to the office, my mum was sitting there and it was weird because my parents haven't really spoken much since their divorce. My parents were like, 'We have to show you this. This is going to be really hard.' Then they played the tape.

''I was watching it with my parents - I was just mortified. My dad's in his eighties so it was traumatising watching a sex tape with him. It was really upsetting me that my mum was crying so much.''