The group went out to Mahiki cocktail bar in London's Mayfair to celebrate as the X Factor star from Essex turned 24.
Rylan tweeted yesterday: "So it's my big birthday party tonight and turning 24 tomorrow!!! How unreal to have my birthday with all my friends old and new xxx"
And it seemed like the other contestants were pretty excited for what the night had to offer.
"RYLAN birthday suprise celebration!!!!!!! Exciting times! Josh x" Union J tweeted, before revealing: "We're all off to Rylans birthday party dressed as crazy surgeons covered in blood! "
District3 added: "Its all about the Rylan Birthday Party tonight!"
The finalists went in fancy dress to the event, with even Tulisa and Nicole getting to the spirit, but it was Lucy's pumpkin costume we loved the most!
The X Factor continues this Saturday night with a spooky Halloween themed episode as the remaining ten contestants perform live once again.
The latest results show follows on Sunday, which will feature performances from Fun. and Robbie Williams, as well as one more act being given the boot.
Browse the pictures below!