The 40-year-old used to be a judge on the UK talent show along with Simon Cowell and Cheryl Cole but they have now been replaced by Gary Barlow, Kelly Rowland and Tulisa Contostavlos while Louis Walsh remains on the panel.
She said in her MyDaily column: 'This year my top Halloween costume tip is to dress up as the X Factor judges. Superpartymasks.co.uk does facemasks of all the 'old skool' judges. Simon, Cheryl, Louis and me.
'If you're dressing up as us you have to make sure you accessorise appropriately though... high-beam white teeth for Simon, mega-glamorous dress for Cheryl, great wig for Louis and skyscraper heels if you're going as me.
'The website also does masks of your new judges Kelly and Tulisa, and of Jedward (bad dance routines optional).'