Rihanna just debuted her River Island Collection during London Fashion Week which officially gives her an invitation to the celebrity fashion designers  club.

Celebrities can be great people to look up to when looking for style inspiration, but some celebs are a little bit easier to channel sartorially than others as you can purchase a little bit of them through their own fashion lines. However not every celebrity-turned-designer are as good as others.

Let us guide you through the messy world of celebrity fashion lines to see which celebrity fashion lines you should save your change for. We break down who’s worthy of becoming a fashion brand, who’s merely a hit, and who should keep their day job in one handy dandy list.

1) Mary-Kate & Ashley Olsen: The Row, Elizabeth & James, Olsenboye, StyleMint, and Mary-Kate and Ashley for Wal-Mart.

Where to begin with Mary-Kate and Ashley Olsen? The famous duo got their start in the entertainment industry at the ripe ol’ age of six month, when the fraternal twins took turns playing baby sister Michelle Tanner on Full House. That was only the beginning and they went on to build an empire worth over one billion dollars. Apart from the iconic role of Michelle Tanner and their many movies and other T.V. shows, the twins managed to create a name for themselves within the fashion industry.

Mary-Kate and Ashley Olsen top our list because not only have they had a head start in the business than most celebrities, their many fashion lines have managed to boost their fledgling adult acting careers and have given them a new sense of purpose and career path. Their many successful fashion lines have been the envy of other celebrities since they are quintessentially the blueprint for other celebrity fashion lines. The sisters have all markets covered from luxury brand The Row, to mid-market brand Elizabeth & James (the Elizabeth is for their sister who has now become a in-demand actress herself), and Olseneboye which is an exclusive partnership with mass-market department store JC Penney.

So not only are their fashions available to everyone which score major points, but when other celebrities where your clothes then you know you’ve made it as a fashion designer.

Verdict: Major Fashion Brand- for their mass market and high fashion appeal and high-end and low-end price ranges.

2) Victoria Beckham: Victoria Beckham Collection, dvb, and Victoria by Victoria Beckham.

While as Posh Spice, Victoria Beckham wasn’t the usual centre of the attention as she had to compete with the more in-your-face members of the iconic girl group, the Spice Girls. But now that she’s been on her own, Victoria probably commands the most attention from the public than any of the other members of the Spice Girls. While she did attempt and ultimately floundered at a solo pop career, Victoria has maintained her A-list status as a major fashion icon– all thanks to her impeccable fashion sense, her superstar athlete of a husband David Beckham, and her trademark pout.

What makes Victoria Beckham’s fashion lines so successful is that she’s the best brand ambassador for her clothing. Wonder what she’s wearing in all those various paparazzi shots of her? Well she’s most likely wearing her own clothes! Other stars have taken notice as well, having been spotted and photographed wearing clothes from Victoria’s collections. (Other celebrities wearing your designs a major fashion coup!) The problem with celebrity fashion lines are that the celebrities hardly ever wear their own designs! While celebrity designers might don their own designs once in a while, they are never as consistent as Victoria Beckham.

Verdict: High Fashion Brand- for its high fashion appeal but unfortunately her clothes have high-end to mid-market price tags on them. So you better save up!

3) Rachel Zoe: The Rachel Zoe Collection and Luxe Rachel Zoe. Read more…