Ex-Atomic Kitten star Jenny Frost looks just purr-fect in her sheer black dress at the Emeralds & Ivy Ball

By Emily Sheridan

Last updated at 1:23 AM on 4th December 2011

As the co-host of the Emeralds & Ivy Ball, Jenny Frost was hoping to make a good impression.

And she certainly made an impact last night as the ex-Atomic Kitten singer arrived on the red carpet in a sheer black dress, which clearly showed her underwear.

The OK! TV host, 33, showed off her slim figure in a Lisa Jayne Dann dress with a leaf pattern and split at the front, which she teamed with a pair of Christian Louboutin heels.

Lacy lady: TV presenter Jenny Frost shows off her figure in a sheer Lisa Jayne Dann dress at the Emeralds & Ivy Ball at the Embankment Gardens

And it appeared her risque dress went down well with the guests, as she wrote on Twitter: 'I love my dress and so does everyone else - I'm auctioning it off!!! Thanks girls.'

Accompanying Frost to the ball was her new husband, Spanish scuba diving school owner Vicente 'Vinnie' Juan Spiteri.

The couple wed at their home in Ibiza in August and now split their time between the UK and Spain.

Family man: Host Ronan Keating arrived with his wife Yvonne and their three children Jack, Melissa (middle) and Ali (front right)

Ahead of the event, she tweeted: 'Just getting my hair done, off to co-host with the rather yummy Ronan tonight at his annual Emerald & Ivy Ball x.'

The event was organised by Ronan Keating with proceeds going to Cancer Research and the Marie Keating Foundation, set up in honour of his late mother.

He was supported at the ball by his wife Yvonne and their three children Jack, Marie and Ali.

In fact, the evening marked 12-year-old Jack's stage debut.

Coupled up: Frost attended with new husband Vicente 'Vinnie' Juan Spiteri (left), while Rod Stewart arrived with wife Penny Lancaster

Tweeting beforehand, proud Ronan wrote: 'Jack is the surprise guest.'

He also uploaded a photo of his son with his guitar, writing: 'Jack ready for his first gig.'

And perhaps the partygoers could have looked to Nancy Dell'Olio for some of the entertainment following her recent stint on Strictly Come Dancing.

The Italian-American lawyer, 50, looked suitably glam in a strapless black ballgown and a sweptback updo.

Belle of the ball: Strictly Come Dancing star Nancy Dell'Olio looked very glamorous in a black ballgown

Feeling chilly? Leona Lewis teamed her pink ballgown with a purple jacket

Also in a ballgown was singer Leona Lewis, who may have been feeling chilly as she teamed her pink number with a jacket.

And there was no missing Rod Stewart's wife Penny Lancaster, who teamed her green asymmetrical mini dress with loud matching tights - taking the Emerald theme of the ball quite literally.

Representing the football world were former England stars Alan Shearer and Sol Campbell.

Shearer's wife Lainya showed off her trim figure in a silver bandage dress, while Campbell's interior designer wife Fiona wore an asymmetrical maxi dress.