Nina Dobrev and crew were all about the girl power with their Spice Girl costume.
 

Cindy Crawford went for a modern day Marilyn Monroe, switching the flowy white gown for a form fitting dress.
 

Roberto Cavalli took his Halloween inspiration from fellow designer Karl Lagerfeld.

Audrina Patridge’s Like a Virgin outfit gave us major 80s flashbacks.
 

Kelly Ripa and Nick Lachey dressed up as Kim Kardashian and her 6’9 hubby on the same day they announced their divorce.
 

Lauren Conrad tweeted this photo of herself as …Baby One More Time’s Britney Spears.
 

With a bright yellow wig and leopard leotard, Miley Cyrus transformed into Nicki Minaj.
 

Ellen DeGeneres also impersonated Nicki Minaj for a Halloween episode of The Ellen Show.
 

British actress Ashley Madekwe and her boyfriend paraded as fashion duo Karl Lagerfeld and Choupette.
 

Miley Cyrus went as Lil’ Kim on the MTV video awards red carpet circa 1999.

Paris Hilton dressed up as the Material Girl herself, Madonna.
 

And because 2 costumes are better than 1, Paris Hilton also donned Miley Cyrus’s famous VMA bodysuit.
 

Holly Robinson Peete put on a white and pink wig for her Nicki Minaj outfit.
 

Beyoncé and Blue Ivy teamed up as the Jackson family’s Michael and Janet.
 

Kate Moss as Cara Delevingne: From one supermodel to another.
 

Kim Kardashian and gang transformed into fellow fashion powerhouses Anna Wintour, Grace Coddington, André Leon Talley and Karl Lagerfeld.
 

Lance Bass did a #tbt to his boy band self.

Kaley Cuoco was so believable as Justin Bieber he should hire her as a body double to avoid the paps.
 

Josh Duhamel was spot on with this Karl Lagerfeld getup, complete with Fergie as the famous Choupette.
 

Chrissy Teigen is unrecognizable as television personality Guy Fieri.
 

Tyler Blackburn went old school with this Charlie Chaplin costume.
 

Victoria Justice paid tribute to her idol Amy Winehouse.

Co-hosts Kelly Ripa and Michael Strahan took their Halloween inspo from the Super Bowl. Kelly paraded as California Girl Katy Perry with Michael as perhaps the even more famous left shark.