The name William Rast comes from the combination of Timberlake’s grandfather’s first name and co-founder Trace Ayala’s grandfather’s last name. (Instagram/justintimberlake)

Named after her daughter, the line originally focused on jewellery, but has since branched out to include sunglasses, handbags, shoes and apparel. (Instagram/houseofharlow1960)

It started with shoes and has morphed into a multi-faceted fashion brand, which includes clothing, swimwear, handbags, hair and beauty products that all have the JS stamp of approval. (Instagram/jessicasimpsonstyle)

Just in case you needed another reason to fall in love with Pharrell, the musician is the creative director of this startup which is focused on taking the plastic that pollutes the world’s oceans and making it into fabric for clothes. (Instagram/bionicyarn)

If SJP’s “Sex and the City” character was known for one thing, it was her incredible shoe collection. So no one was surprised with the TV star partnered with Nordstrom to create her own shoe line not long after the show wrapped. (Instagram/sjpcollection)

Recently launched in the spring of 2016, the young singer, actress and producer added shoe designer to her title. (Instagram/dayabyzendaya)

Easily one of the most controversial shows at New York fashion week, the singer/rapper knows how to stir the pot whether it’s with his music or his fashion. (Photo by Randy Brooke/Getty Images for Kanye West Yeezy)

Who doesn’t envy Kate Hudson’s incredibly toned bod? The super fit star launched her online subscription sportswear in 2013 so we could all get fit looking fashionable like her. (Instagram/fabletics)

Part of the Canadian rapper’s OVO empire, the clothing line features hats, hoodies and tech accessories. (Instagram/welcomeovostore)

Even if you weren’t a fan of “The Hills” reality star Lauren Conrad, you have to admit girl knew how to rock a flowy dress. Which is why it made perfect sense when she launched her own clothing line of dreamy dresses that has now expanded to include bridal. (Instagram/papercrown)

Gisele posing in underwear is nothing new, but when it’s underwear she designed herself, that changes things. If the former VS angel knows one thing, it’s how to look good in very little, so hats off to her for branching out on her own. (photo: Gisele Bundchen Intimates)

One of the first musicians to delve into the world of fashion, Puff Daddy launched his line back in 1998. (Instagram/seanjohn)

The stylish Spice Girl took her love of fashion to the next level when she launched her denim line back in 2007. Switching gears to designer fashion in 2008, her line won Designer Brand of the Year in 2011 and is regularly worn by herself as well as celebrities like Blake Lively, Olivia Palermo and Miranda Kerr. (Robert Kamau/GC Images)

One way to look as good as Britney does in underwear is to buy underwear designed by Britney. (Instagram/intimatebritneyspears)

Fun, affordable fashion from fashion’s original leading lady. (Photo by Kevin Mazur/WireImage)