Held at the finalists' £6 million Hertfordshire mansion, Jones's frolics with the contestants will be shown on this weekend's Xtra Factor.
The Circus of Horror also provided entertainment during the evening.
The party allowed the final 16 a chance to bond and celebrate Rhythmix band member Leigh Anne Pinnock's birthday.
Writing on Twitter, Jones said: "On route - X Factor contestants house - pool party - I'm the DJ - boooom. Hope your ready for Ibiza time!!!"
Jones had his photo taken with the reality show's stars including Frankie Cocozza and Amelia Lily and was given some Fosters beer by soldier-turned-singer Jonjo Kerr.
Birthday girl Pinnock tweeted: "Had a wicked b-day last night with Xtra Factor, her Rhythmic chikas and @officialtulisa."
The X Factor Live Shows kick off this weekend with a double bill on Saturday and Sunday and a surprise twist, which has yet to be announced.
> 'The X Factor': What is this weekend's big twist?
See the pictures of the final 16 below: