Pregnant pop star Una Healy is glowing in gold as The Saturdays rock the Jingle Bell Ball

By Emily Sheridan

Last updated at 10:06 PM on 4th December 2011

She's six months pregnant with her first child, but The Saturdays singer Una Healy isn't ready to change into billowing maternitywear any time soon.

The Irish pop star, 30, still looked as sexy as her bandmates as she performed in a gold mini dress at the Capital FM Jingle Bell Ball in London tonight.

Joining Rochelle Wiseman, Mollie King, Frankie Sandford and Vanessa White on the red carpet, she proudly showed off her growing bump in her shimmering number.

A Jingle Bell smock? The Saturdays singer Una Healy shows off her growing bump in a gold mini-dress at the Capital FM Jingle Bell Ball at London's O2 Arena

All fired up: Una joined her bandmates (L-R) Mollie King, Rochelle Wiseman, Frankie Sandford and Vanessa White on stage

She complemented her bandmates, who were all dressed in gold and white creations to get into the Christmas spirit.

Blonde King, 24, showed off her tanned legs in a bottom-skimming white mini-skirt and gold sequinned top, while Sandford, 22, flaunted her toned figure in a white cut-out dress.

The fivesome performed hits from past and present albums, including Higher, Notorious, Ego, My Heart Takes Over, Forever Is Over and All Fired Up.

Busy: The girl group travelled down from Liverpool on Sunday specially for their performance at the Jingle Bell Ball

Charlie's Angels: The group put on quite a few poses as they worked the stage

Ahead of the Jingle Bell Ball, the group travelled 230 miles after performing at the Echo Arena in Liverpool last night as part of their All Fired Up tour.

Despite being pregnant, Healy hasn't let her expectant state slow her down during rehearsals over the past few weeks.

Mollie said last week: 'Una is such a trouper, she hasn’t missed one rehearsal. We can’t hold her down. There’s no sit-down or wheelchair for her. We’re all up there busting a move.'

Back in the fold: Sandford is enjoying being back in the group after taking time off for health reasons

Glam: The group looked suitably festive in their white and gold outfits

And Una admitted she's been loving the attention on her bump and doesn't even mind when people touch it.

She said: 'It's quite a loving thing. You feel it's because they know it's quite a special thing going on in there. I know some people get freaked out by it, but I like it.'

While The Saturdays looked festive in their gold and white, their contemporary Jessie J wasn't quite into the Christmas spirit yet when it came to her wardrobe.

That's not very festive: Jessie J wore shorts and a floor-length cardigan to the ball

The singer, 23, wore a pair of black shorts, T-shirt and floor-length black cardigan as she arrived on the red carpet.

The annual Capital FM Jingle Bell Ball was hosted by Lisa Snowdon, who presents the station's breakfast show.

She recently lost her partner-in-crime Johnny Vaughan, who is being replaced by Dave Berry.

Also performing at the gig were X Factor boy bands JLS and One Direction.

Their sets came as they hit the No.1 spot in the UK singles chart with this year's X Factor finalists with Wishing On A Star.