LONDON (AP) -- London Fashion Week swings into star time with a debut fashion show from pop star Rihanna and other big design names, including Issa and Jasper Conran.

Rihanna for River Island is set for Saturday night, followed by an elaborate party in central London.

The five-day fashion spectacle will also include upcoming shows from Vivienne Westwood, Burberry, Temperley and -- for the first time offering a full catwalk show in London -- Tom Ford.

There also are dozens of smaller shows and presentation by a wide variety of up and coming fashion names as well as established draws such as Christopher Kane, Roksanda Ilincic and Erdem.

The London shows mark phase two of the "Big Four" fashion weeks, with Milan and Paris to follow.