Giggs did a kiss-and-tell on her eight-year affair with the Manchester United footballer, who is her brother-in-law, last year.
Following her recent reality TV stint in the Big Brother house, Natasha has come under fire again for her actions and has been warned to contact police about comments from a Twitter user who claimed that they would be "twitter's first killer tweeter".
The social network user posted a picture of himself shirtless and wrote: "Don't ask questions just stay away from Natasha over the next few weeks! Listen to this advice! I am doin u a favour. [sic]"
He told Natasha: "It amazes me you thought u could get away with being a whore without punishmet... thearrogance astounds me! Your mistake!
"I will enjoy you more than enyone previous! U deserve it the most u r worthy!!! I can't wait to see the pain and fear in yr eyes@NatashaGiggs."
Greater Manchester Police contacted Natasha about the threats after being alerted by Twitter users and are trying to trace the poster, who has the handle Jesery Justin.
> Natasha Giggs blasts kiss-and-tell: 'I don't care, I'm moving on'
> Natasha Giggs, Imogen Thomas clash on Twitter over Ryan Giggs affairs