Taylor Swift has threatened to sue her old guitar teacher.

Computer repairman and part-time musician Ronnie Cremer recently spoke about how he gave the 'Shake It Off' hitmaker music lessons when she was younger, and since then he has registered the website ITaughtTaylorSwift.com, much to the fury of her representatives.

TAS Rights Management, LCC emailed Ronnie last week to say the domain name ''incorporates the famous Taylor Swift trademark in its entirety and suggests TAS's sponsorship or endorsement of your website. The Domain Name and your use of the Domain Name are also highly likely to dilute, and to tarnish, the famous Taylor Swift trademark.''

The letter went on to ''demand'' the technician give up the name within three days of receipt, but he insists he won't back down.

He told the New York Daily News newspaper: ''I almost feel like they were trying to bully me a little bit.

''I'm not giving back the domain name. I mean, Go Daddy sold it to me.''

Ronnie also admitted he has received hate mail after revealing he was hired by Taylor's parents to give her guitar lessons when she was 12, disputing the 25-year-old singer's previous claim that she was offered lessons by a computer technician while doing her homework.

He said: ''I got a lot of hate mail from Swift fans who just do not want to believe under any circumstances that Taylor lied to them.

''That's she's just not capable. That her story, that she called a 'magical twist of fate' story, could ever not be the truth. And I just feel like if I keep getting the story that was told by you out there, and other bits, that the truth will finally come out, and she will have to acknowledge.''