When it comes to coaching on The Voice, you can argue that Christina is better than Gwen or vice versa all you want. But when fashion comes into the mix, it's fair to state they're both two of the biggest style risk-takers in the biz.
As you study Gwen's coaching methods and prep for Christina's return, flip through this gallery and preview their craziest outfits ever. We promise it'll be entertaining.
The "Genie in a Bottle" singer started off her career sugary sweet with Cinderella-like gowns that screamed early 2000s fashion. This crop top number will never be forgotten.
At the 2000s MTV VMAs, Christina showed up in...barely anything at all! Angelina Jolie's high-slit dress has nothing on this shocker.
red-dress 7th Annual Blockbuster Entertainment Awards
The hair... The dress... The HAIR! While we don't expect Christina to show up on The Voice stage wearing something exactly like this velour fringe moment, we have seen her rockin' a few curly 'dos.
When you're not sure what top to put on in the morning... just wear a scarf? We doubt that was the reason Christina decided to wear this Daisy Dukes and cleavage-baring blouse (if that's what it actually is?). This look goes down in the books!
After the 2004 Grammy Awards, Christina went for a disco-savvy look with a multicolored mini dress and fishnets.
christina-marilyn 2004 MTV Video Music Awards - Arrivals
Before Christina went brunette, she was working a Marilyn Monroe vibe in like, all of her outfits.
She's just a girl—working blue hair, mini pigtails, and a furry blue bikini top on the red carpet. Duh. In 1998, Gwen Stefani regularly flashed some midriff in these bold outfits. Think she'll recreate this outfit for a throwback moment on The Voice this year?
Gwen Stefani wore about 245 versions (OK, we're exaggerating) of this outfit—cropped white tank, boot cut pants, and a scarlet red lip to match.
gwen-stefani-fishnets Celebs Attend 2001 VH1/Vogue Fashion Awards
Christina isn't the only judge of The Voice who had a thing for fishnets. Gwen Stefani wore a fishnet crop top AND fishnets under her denim capris to the Vogue Fashion Awards in 2001.
Gwen Stefani switched out her edgy crop tops for this soft plaid and ruffled moment she wore on TRL back in 2004.
Only Gwen Stefani could make this frilly number work. She rocked this girly girl look during her Harajuku Lovers Tour.
Gwen's style has definitely changed throughout the years, but she hasn't lost her retro pop. This hot pink moment at the 2014 MTV VMAs is a gem.