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The Diary: Rosanna Davidson at London Fashion Week

London Fashion Week is in full swing this week, and I've got nothing but parties and launches to attend over the coming days. It's a hard life!

Even though I've only been here two days, I've already met Sienna Miller, Matthew Williamson and Twiggy so I'm definitely clocking up the celebrity count.

On Saturday afternoon, John Rocha's Irish fans were out in force to support the acclaimed designer's autumn/winter 2010 collection, showcased at the elegant Somerset House in central London.

I bumped into MTV presenter Laura Whitmore, while property tycoon Harry Crosbie showed up with a group of friends and artist Guggi. They were all lucky enough to enjoy the show from a prime front-row seat.

Rocha's collection was as eclectic as always and focused on weird and wonderful silhouettes, in muted shades of browns, black and nudes.

Picking the right outfits for these super-chic fashion shows is never easy, but I decided to go for the summery option -- it is meant to be spring after all.

In the end I chose a Snob leather jacket and floral dress by label Darling, but I felt slightly out of place amid the sea of ubiquitous black outfits that everyone was wearing.

Looking more like Beefeaters than anything else, all the models took to the catwalk wearing these tall, stacked bonnets which definitely caught everyone's attention.

A quirky east London equestrian theme ran through the designer's men's collection.

It was all bowler hats and leather boots, while the women were beautifully styled in full skirts, capes, knee-high socks, tulle petticoats and trapeze dresses.

The next stop for me on my whirlwind tour of the fashion shows was celebrity designer Jayne Maskrey.

And given that such high-profile stars as Britney Spears and Halle Berry have worn her designs, she's clearly doing something right.

She also styles The Edge so she's highly regarded in the industry.

I was lucky enough to nab an invite. Entitled Pleasure, the collection was inspired by a 1930s black-and-white movie called The Mask Of Fu Man Chu.

Another of her collections could only be described as futuristic biker chic, with all the girls dipped in sparkling diamonds and crystals. Think super-luxe criminal with a sexy attitude.

The sexy theme continued through to the glamorous after-party at the On Off venue in Bloomsbury Square.

There was no shortage of Champagne flowing to get everyone in the party mood. Also helping get things going were the chart-topping band Sugababes.

They were dressed in tiny figure-hugging mini dresses and performed a funky, really upbeat set.

Dragging myself out of bed at 7am the following morning was no mean feat, but it was worth it to take in Betty Jackson's autumn/winter offering.

And it couldn't have been more different to Rocha's, as it focused on military jackets, baggy trousers and tops in shades of burnt ochre, khaki and brown.

Tunics and loose waistcoats added to the casual workwear vibe, with leather bodices lending a hard edge to printed shirts.

In the evening, the next stop for me was the opulent interior of London's luxury venue, Two Temple Place.

It was the turn of Jude Law's on/off girlfriend Sienna Miller and her equally gorgeous sister Savannah to showcase the newest collection for their label 2812. Rather than hosting a fashion show, the sisters chose to display their creations in a far more simple and intimate way. They did away with the runway format and had the models sitting or standing serenely on two platforms in the centre of a wood panelled drawing room.

The handpicked group of buyers, photographers and fashion writers could then view the collection up close, at their leisure.

When the media scrum in one corner of the room subsided, the sisters emerged.

I had a brief opportunity to meet them and congratulate them on their collection, before they disappeared to mingle with guests including Twiggy, Matthew Williamson, and award-winning fashion director, Hilary Alexander.

Sienna revealed how the collection was inspired by the London luxe-casual style, with quirky prints and pieces to carry the wearer smoothly from day into night.

Boxy denim jackets were teamed with woolly hats and warm long-sleeve dresses, distressed denim and jazzy printed leggings.

It was great fun seeing all the new trends, especially for a fashion-lover like myself.