Guest X Factor judge Rita Ora meets the fans as she arrives at the X Factor auditions at the O2 in Greenwich, London. Photo: Max Nash/PA Wire

Chart Rita Ora helped to bling up the latest X Factor auditions at London’s O2 Arena when she appeared as a guest judge.

The singer wore shades and a white dress and jacket as she traipsed up the red carpet.

Fellow judge Tulisa Contostavlos arrived wearing a turquoise patterned mini dress with skater skirt detail and studded high heeled ankle boots.

Ora - whose hits include Hot Right Now and RIP - is the latest guest judge and follows Geri Halliwell on to the panel until a permanent fourth member is appointed.

Kelly Rowland made clear last month she would not be returning, and talks with Dannii Minogue to engineer a return stalled.

Hundreds of people turned up to see the judges arrive as they find contestants for the next series of the ITV1 show.

Take That’s Gary Barlow ditched his usual black jacket for a pastel blue linen number, coupled with a grey t-shirt. And Louis Walsh turned up in aviator shades as he attended the auditions for the series which returns later this year.

The judges posed for photos on the red carpet and met fans as they made their way into the O2.