On Saturday nights X Factor, Dannii Minogue surprised us all by not wearing J’Aton Couture.

Instead she wore a strapless gown slashed to her thighs by Australian designer Lisa Ho.

It’s a beautiful look, but Dannii has spoilt us with so much couture this series that this look didn’t have same wow factor as previous week.

I loved Danni’s hair, and the stunning silver statement necklace she paired with her sandy gown.

I loved Dannii’s Lisa Ho Spring 2009 printed kaftan, but it didn’t feel quite right for a Sunday night TV show.

It was perfect for St.Tropez or some other luxury holiday, but alongside Cheryl’s futuristic look Danni looked really out of place.

I also didn’t like her ponytail.

Firstly because it was crimped and secondly because I’ve grown so fond of her with shorter hair.

Burgundy YSL heels completed the look.

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For once I loved both of Cheryl Cole’s looks on the X Factor this weekend.

On Saturday night I instantly recognised Cheryl’s plunging Alexander Wang draped sequin mini dress, as I was cruising this same dress on Friday in Selfridges.

This dress much preferred to her Jean Paul Gaultier look of last week, which felt too old for her.

She looked stunning, happy - despite her reported marriage troubles - sexy, confident and I loved how her hair was pulled back to complete this sleek look.

Silver peep-toes complemented that massive rock on her finger.

This was my favourite look so far.

Although the big hair was back on Sunday with this look, I didn’t mind it so much as I wasn’t as over the top as we know Cheryl’s hair can get.

Her Richard Nicoll corset dress with gold panels had a futuristic feel to it. If Star Wars was made today I feel Princess Leia would love this dress.

After a few weeks of Danni being on top, this was very much Cheryl’s week.

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The theme for Saturday’s X Factor was “Movie Week and Dannii Minogue very much looked like a movie star in her Ralph & Russo angelic one-shouldered gown.

I loved the sexy thigh-high split, the sweet-heart neckine and the bejeweled detail on the waist.

Dannii has been very faithful to Australian designers thought-out the X Factor, so you won’t be surprised to know that the design duo Tamara Ralph and Michael Russo are Australia.

After being edged out to the last seat on the judging panel on the X Factor last week, Dannii was back to sitting next to Cheryl.

Hopefully that will be the end of the musical chairs.

On Sunday nights show, Dannii wore a J’Aton Couture bustier dress which was wrapped in a layer of tulle.

It was another interesting choice, but it’s the asymmetrical hair I just couldn’t get on board with.

When Dannii cut her hair before this season’s X Factor it was the best thing she ever did as it made her stand out, but this style feels so lopsided.

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On Saturday I couldn’t help but be disappointed watching Cheryl Cole walked onto the X Factor stage.

After her bold David Koma statement dress, her Jean Paul Gaultier Fall 2009 sheath dress was tame in comparison.

I can only believe that the criticism of last weeks choice got to her.

Her JPG dress was instantly recognisable by the X on the bodice, which was featured on many pieces in the Fall 2009 collection.

Her dress appeared to be modified slightly from the runway, as her dress was embellished with black crystals to allow the dress to sparkle on screen.

She paired her dress with black platforms.

The dress was just OK, but the hairstyle felt very dated.

She should’ve pulled it back to show off the X and details on her dress.

I loved Cheryl’s burst of colour on Sunday nights show.

The judge wore a Marios Schwab shift dress with crystal-embellishments in an opening in the bodice from the Fall 2009 collection.

She interesting paired her dress with nude heels.

Again I had a problem with the hair.  On Saturday night it felt to dated, whereas her hair on Sunday nights show looked like the stylist got his inspiration from a local school playground.

You may remember that Sienna Miller wore a watered down and nearly unrecognisable version of this dress earlier this year.

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Whilst Cheryl Cole was going for the shock factor on Saturday’s X Factor show, Dannii Minogue’s look was more refined.

The judge who is mentoring the girls opted for another J’Aton Couture gown which was just a breath-taking as her gown last week.

Her asymmetrical one-sleeved glittering gown which was accented with a black thin belt, had a delicate lace bodice.

I loved her wavy updo and her soft make-up.

Black platform heels completed her look.

Her second look was a bold shouldered LBD by J’Aton Couture paired with a steel waistband and gold YSL peep-toes.

This look was less dramatic than previous looks but she still looked gorgeous, even with the slightly crimped hair.

In order to still show her respect for the poppy appeal, she wore her poppy as a bracelet.

It has been reported that Simon Cowell is unhappy about the Cheryl and Dannii stealing all the spotlight with their fashion choices.

Apparently he told the girl’s that it was a talent show and not a fashion show. I would say he should concentrate on remembering the contestants names.

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On Saturday night on the X Factor it was Rock week.

I half expected Cheryl Cole to come out wearing a rock chick-inspired Balmain look, but she surprised everyone by wearing a black David Koma Fall 2009 mini dress with Tabitha Simmons Carla suede thigh-high boots.

Her halter neck keyhole dress had an interesting bodice detail of silver tone tubes.

The dress was an interest bold choice, and totally different from what we have seen on the Atelier Versace loving X Factor judge.

I wasn’t crazy about the look, but I didn’t hate it.

I would’ve dislike her look if her hair wasn’t pulled back. The bouffant wouldn’t have worked with this look.

Georgian born designer David Koma graduated in 2009 with distinction in MA Fashion from Central Saint Martins.

David’s pieces are sold exclusively online at Browns Fashion.

After Saturday’s show the press heavily criticized Cheryl’s David Koma dress, saying it looked like a pair of alloy wheels or dustbin lids.

This criticism may have been the reason why Cheryl toned down her look on Sunday night.

She still managed sparkle with her gorgeous smile and gold sequined Les Chiffoniers pants, which she wore with an asymmetrical black slashed top.

Slashed tops was one of the major trends of Spring 2010 fashion week.

She accessorized with a gold peep-toes, a selection of bracelets and a poppy.

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One is a wannabee singer appearing on a talent show in the UK, the other is a singer appearing on a dancing show in the US.

Both performed wearing a Topshop spot mesh dress last month within days of each other - you can check out their performances below.

X Factor contestant Stacey Solomon was the first to wear the one-shouldered Topshop dress when she performed the Etta James classic “At Last” during week 2.

She wore her dress with Pied a Terre Atessa two-tone Mary Janes, and a black sash was tied around her waist.

10 days later Taylor Swift performed her newest single “Jump Then Fall” on ABC’s ”Dancing with the Stars” wearing the same Topshop dress.

She paired her dress with black peep-toes.

The dress is made more interesting with the sash, and the Pied a Terre two tone heels perfectly complement the dress so Stacey from Dagenham wins for me.

This dress is sold-out online, but I saw some in Topshop Oxford Circus this weekend so check your local store.

Credit: Rex Features, TaylorSwiftWeb & Topshop