Ashley Olsen and Mary-Kate Olsen at the 2012 CFDA Fashion Awards at Lincoln Center in New York City. Ashley Olsen and Mary-Kate Olsen at the 2012 CFDA Fashion Awards at Lincoln Center in New York City.

With the birth of twins welcomed by two A-list couples — Beyonce & Jay Z and George & Amal Clooney — the fashion world has a serious case of twin fever!

You’re probably already familiar with the handful of famous twins that populate the upper tiers of Hollywood. It’s worth taking a close look at the personal styles of dynamic duos like Tia & Tamera Mowry and Mary-Kate & Ashley Olsen. Do these siblings deliberately dress alike? Or are their distinctive styles the only thing that helps us tell them apart?

Charlotte & Samantha Ronson

As a fashion designer, Charlotte Ronson takes her wardrobe seriously. Her twin sister, DJ and singer-songwriter Samantha Ronson, is also known for her spunky sense of style, which tends to be a bit more playful and flashy than her twin‘s refined, polished tastes.

Benji & Joel Madden

As famous as they are, it can be hard to tell the Good Charlotte brothers apart when they slip on their shades. Accompanied by his wife, Nicole Richie, Joel can often be spotted in a sophisticated suit with subtle styling touches. His identical brother Benji (whose equally high profile spouse happens to be Cameron Diaz) is also not one to shy away from a dapper tux. Off the red carpet and onstage, their styles are pure rock and roll with hints of punk and grunge. They even started their own fashion line, MADE Clothing, which they followed up with a lifestyle brand, DCMA Collective.

Tia & Tamera Mowry

It’s fortunate that both Mowry sisters shake up their hair and makeup routines frequently, because otherwise it would be extremely difficult to tell them apart! The identical singers and actresses have both varied their hairstyles dramatically over the course of their career, trying out braids, adopting bouncy curls, and straightening for sleek shine. As for apparel, both are equally likely to be spotted in fun, colorful dresses and sophisticated gowns.

Mary-Kate & Ashley Olsen

The most famous of celebrity twins, Mary-Kate and Ashley Olsen are as well known for their fabulous fashion as for their acting credentials. Their clothing line The Row remains a popular source of ready-to-wear items as well as handbags, eyewear, and footwear. While they love to coordinate ensembles, especially on the red carpet, Ashley’s style is noticeably more whimsical and bohemian, whereas Mary-Kate tends to be a little more reserved. — jas