Aguilera kicked off her career with a hairstyle that looked similar to “the Rachel.” Her blonde, face-framing layers were so late ’90s — in the best way.

Aguilera rocked voluminous curls to the 10th Annual Billboard Music Awards later in 1999 and looked absolutely amazing.

For the new millennium, Aguilera stepped out in one of her most iconic hairstyles: red and black streaks in her blonde lengths. You can almost hear “Dirrty” playing in the background.

In a very early 2000s move, Xtina attended the VH1 Music Awads with her multicolored strands partially crimped. (And this is the reason why I purchased a hair crimper back then.)

When singing at MTV studios in New York City, Aguilera swapped her dark highlights for pastels, which she showed off in a half-up hairstyle. The fact it matched her eyeshadow? Just a (very Y2K) bonus.

Aguilera started early with the statement looks, like this one — with mega curls and tiny braids — at the Seventh Annual Blockbuster Awards, and the world was better for it.

2001 was an extra big year for Aguilera — it’s when Moulin Rouge and “Lady Marmalade” came out — so she went extra big with her hair, too. This curly, braided style with pink highlights was a standout moment.

Ah yes, the famous black and white-blonde two-tone highlights. When you think of early 2000s Xtina, this is likely what comes to mind. The fact she wore it with blue eyeshadow, a frosted lip, a statement tee, and a trucker hat? Those were the days.

To glam it up for VH1’s Big in 2002 Awards, Aguilera straightened her two-toned strands into a red carpet-worthy look.

Who could expect a giant pile of bleached blonde hair, intricate face gems, and a red lip? When Xtina is performing, anything is possible.

The singer completely flipped the script in 2003 when she walked the MTV Europe Music Awards red carpet with black waves. This is when she started to step away from early-2000s highlights and into her Old Hollywood era.

Xtina went back to blonde when performing on stage in 2004, this time with a head of retro pin curls.

By 2005, Aguilera was softening her look even more. For an US Weekly Young Hollywood party, she wore her blonde hair in loose waves and a deep side part.

It’s hard to tell whether this is from the year 2006 or 1946, because Aguilera was out there absolutely nailing the retro look.

In 2007, Xtina stepped onto the Emmy Awards red carpet with a perfectly coiffed updo. The singer was well-known for her love of blonde hair by this point — and she ended up sticking with it for years.

Every girl’s got to have a bang moment. Aguilera had hers in 2008 at the MTV Video Music Awards.

For her “Inspire” fragrance launch in 2008, Aguilera posed with platinum baby bangs and a high pony.

The singer made a big change in 2009 when she was spotted with an extra short blunt bob.

Xtina added some color back into her hair in 2010 with a pastel pink braid.

While performing on stage at the 2011 American Music Awards, Aguilera made sure everyone knew she had diva energy with big blonde curls.

In 2012, Aguilera heated things up with fire-engine-red dip-dyed ends in her blonde lengths.

Aguilera never repeated a look while on The Voice. In this 2016 shot, she rocked lilac locks pierced with metal rings.

In the perfect throwback to the early 2000s, Xtina attended the 2021 People’s Choice Awards — where she scooped up The Music Icon of 2021 award — with her signature black and white strands.

To walk the red carpet at The 23rd Annual Latin Grammy Awards in 2022, Aguilera sported ice blonde hair, face-framing tendrils, and a middle part.

While performing at LA Pride’s Official In-Person Music Event in 2022, Aguilera worked the stage with rainbow hair tinsel to match her rainbow outfit. Natch.

Aguilera performed at the Lovers & Friends music festival in May 2023 with waist-length bleached-blonde locks that flowed perfectly in the wind. The extra length was so Xtina.