Nicole Scherzinger takes the Mean Girls approach to Halloween, while Tulisa vamps it up

Above: Nicole Scherzinger took the Mean Girls approach to Halloween, but Tulisa dressed up as a vampire

ABOVE: Rylan Clark was celebrating his birthday and dressed up as a zombie American footballer player

ABOVE: District 3 went as red devils (with wings), while the boys went for the minimal-effort approach

ABOVE: Union J dressed up as zombie surgeons for Rylan Clark's big bash

ABOVE: Lucy Spraggan looked amazing in a pumpkin costume

THIS is a bit of a poor show, isn't it?

Nicole Scherzinger had a massive costume #FAIL last night after showing up to Rylan Clark's Halloween birthday party looking attractive.

While fellow X Factor judge Tulisa dressed up in a vampire outfit (complete with fangs and fake blood), Nicole took the Mean Girls approach and basically tried to look as hot as possible.

It's hardly acceptable Halloween behaviour, is it?

[ See more: Tulisa uses her red carpet opportunity to check if she's spilled her dinner down herself ]

Meanwhile, Rylan Clark took the opportunity to show off as much skin as possible, dressing up as a zombie American football player with fake muscles and a cropped top - seriously.

Lucy Spraggan chose an awesome pumpkin costume, while District 3 went as red devil bird things - a bit like the ones from The Wizard! of Oz... 'FLY MY PRETTIES, FLLLLLLYYYY!'.

Christopher Maloney, Jahmene Douglas, Kye Sones and James Arthur opted for the standard 'last-minute-just-wear-a-mask' outfits, while Union J were zombie surgeons but looked more like the Ghostbusters might look if someone put them in the washing machine with a dark blue sock.

[ See more: Rylan Clark and Lucy Spraggan become bartenders for the night, new career choice? ]