Pixie’s pal, DJ Nick Grimshaw tweeted: "Just reading through some of Pixie Geldof's death threats. Lol (sic)."
According to the Daily Mirror newspaper, the threats include: "I hate you b***h, f**k I'll kill you.”
However, it appears they have targeted the wrong girl as Harry attended the Burberry show at London Fashion Week to support his reported girlfriend Cara Delevingne, who is a friend of Pixie’s.
Fellow guests couldn't fail to see the "chemistry" between himself and runway star Cara.
A source said: "Harry was smirking every time Cara came along the catwalk.
"He kept looking away to avoid putting her off, but you could tell there was chemistry there - even from the audience."
Harry, 18, was first romantically linked with the 20-year-old model - who he met through friends Pixie and Nick - last month after being pictured leaving a party together in the early hours of the morning.