Britney Spears definitely proved that she's back and hotter than ever, but did she raid her old closet?!

The pop star hit the red carpet at the 2016 Billboard Music Awards on Sunday night, sporting a skintight black lace Reem Acra micro-mini, which featured cap sleeves, a crocheted bodice and a long sheer train. She paired the racy look with knee-high, cage peep-toe boots by Schutz, a super-dark smoky eye and a pale pink lip.

For those of us who love vintage Brit, it took us right back to 2002 ... which may not be a good thing.

Meanwhile, Ciara got some mixed reviews from toofab's fashion experts for showing some serious sideboob in a silver beaded Philipp Plein halter dress, which she paired with matching leather Casadei sandals and a banged updo.

While two of our fashionistas loved the metallic look, the others thought she should have showed even more skin. (If that's even possible!)

One star who stole the spotlight off the red carpet this week was Kim Kardashian, who proved that she can look chic even when she's traveling.

Our panel loved the reality star's "Top Gun"-inspired green jumpsuit, which she rocked with coordinated Yeezy boots and a black Hermes Birkin bag. She opted to go braless for her flight, which amped up the sex appeal even more.

Check out the clip above to see who toofab's Candice Brock, Katie Hayes and Bravo's "Tour Group" twins Jenna and Misty Kingma picked for the best and worst dressed stars -- and take a closer look at the week's buzz-worthy fashion below.

0526_drab_insetLaunch GalleryGettyLast Night's Looks -- Fab or Drab?