Simon Cowell and Britney Spears

X Factor judges Simon Cowell and Britney Spears arrive for the US final party

In the aftermath of the US X Factor quarter-finals, the star judges and final four were looking their best as finalists and past alumni gathered with them to celebrate the move towards the climax of the show's second season in the US. Big changes were made this year to the judging panel, with Britney Spears and Demi Lovato entering the fray, and though Spears has received some negative criticism, she's in truth managed to hold her own on her first run of the show. Certainly the pair, alongside original judges La Reid and show creator Simon Cowell, looked content to be at the event at Mixology in Los Angeles last night (December 6).

Demi Lovato, X Factor US FinalLA Reid, X Factor USA

Demi Lovato rocked a good looking leather jacket whilst LA Reid was his usual flawless self

Mixology played host to the viewing party, with semi finalists Tate Stevens, Fifth Harmony, Emblem3 and Carly Rose Sonenclar being revealed. Stevens was looking typically country, wearing a plaid shirt whilst Fifth Harmony looked as delighted as a group who'd avoided elimination in the final showdown would do; they defeated Diamond White to survive another day.

Tate Stevens, X Factor US

Two of the X Factor final four: Tate Stevens [Above] and Fifth Harmony [Below]

Fifth Harmony, X Factor US

The semi-final shows take place across December 12 and 13, with the final taking place a week later. The winner is still looking pretty close to call, although Carly Rose Sonenclar shot herself right into the reckoning with a stunning performance of 'As Long As You Love Me' by Justin Bieber, the 13 year-old setting herself up as a potential star already. 

Carly Rose Sonenclar, X Factor

Carly Rose Sonenclar shot herself into the reckoning with a stunning quarter-final performance