The 37-year-old mum of five has been engaged four times and walked down the aisle three times, but the dress is believed to be from her marriage to cage fighter Alex Reid from 2010-2011.
The photographs of Katie wearing the dress appear to be taken in the wedding salon of the Wynn Hotel Chapel in Las Vegas, where the pair tied the knot.
The dress was only worn 'to her wedding reception for a few hours' so is 'still in fabulous condition', the eBay description reads.
Celebrity Big Brother winner Katie uploaded the dress to her personal eBay account – The Official Jordan's Closet – only days after her third wedding anniversary with current husband Kieran Hayler.
The Loose Women panellist has revealed she is selling the wedding dress, designed by David's Bridal, because; 'I have built up a massive wardrobe over the last 10 years and now it's time to sort through it'.
The size 8 ivory white sheath dress is covered in droplet-style sequins, with a cut out back and plunging neckline – perfect for any aspiring glamour model.
Whilst the item listing says 'this was expensive', the gown was only listed at £249.99 to begin bidding.
However, due to Katie's loyal fan base, bids have now reached £1000 with still 6 days left to go until the auction closes.
Prior to her relationship with Alex Reid, Katie was married to singer Peter Andre between 2005-2009 after the pair met in the I'm A Celebrity jungle.
They have two children together – Junior Savva Andreas Andre and Princess Tiaamii Crystal Esther Andre.
The Mysterious Girl singer also adopted Katie's first son Harvey – whose father is footballer Dwight Yorke.
The Brighton star, who shot to fame on Page 3 of The Sun newspaper, has not only been looking at her old wedding wardrobe but has been reminiscing online about her previous relationships.
Katie responded to a tweet from none other than Kim Kardashian West, but she made her wait a while for a reply - the original tweet Kim sent was from April 2009.
Kim, who is now married to Kanye West, said; 'Omg Katie Price aka Jordan and her husband Peter are on my flight home from NYC!'
Katie replied at the weekend, saying; '@KimKardashian awe that is so cute! Thankyou Kim!'
We hope Katie isn't get nostalgic about Peter - the Strictly Come Dancing star is now married to Emily MacDonagh and they have a daughter Amelia together.