There's never a dull moment during Halloween , and 2013 was no different! Gisele Bündchen and Tom Brady  were inspired by The Wizard of Oz, channeling Dorothy and the Cowardly Lion at a private event, and Heidi Klum  was almost unrecognizable as an old woman. Meanwhile, Miley Cyrus  brought her best Lil' Kim, Demi Lovato wasn't afraid to get a little creepy, and Julianne Hough's Orange Is the New Black costume stirred up quite a bit of controversy. Take a look at all the stars who were out in full-costumed force last year as you start planning for your own look this year!
Kelly Osbourne went for a Carrie look for Halloween  in LA.
Kate Moss  and Jamie Hince donned Day of the Dead looks for Jonathan Ross's Spooktacular Halloween  Bash in London.
Iggy Azalea  went all out for her Cruella de Vil costume at the VEVO Halloween  showcase in London.
Simon Pegg relived his Shaun of the Dead days as a zombie while attending Jonathan Ross's Spooktacular Halloween  Bash in London.
David Arquette  attended a Halloween  party as Bozo the Clown.
Demi Lovato looked terrifying in the best way at her LA Halloween  party.
Molly Sims walked around LA as a grown-up version of Annie.
Bette Midler got into the Halloween  spirit at the annual Hulaween in the Big Easy event in LA.
January Jones  dressed up as Betty Draper for Halloween .
Heidi Klum  was nearly unrecognizable as an old lady at her annual NYC Halloween  party.
Paris Hilton  hit a bull's-eye with her Miley Cyrus  costume for the Halloween  party at the Playboy Mansion.
Adam Levine and Behati Prinsloo wore classy masquerade ensembles.
Bethenny Frankel channeled old-Hollywood glamour at Heidi Klum 's annual Halloween  party in NYC.
Lily Allen  dressed up as an alien for the UNICEF UK Halloween  Ball in London.
Lorde looked like she was going goth at London's VEVO Halloween  Showcase.
Katie Couric attended NYC's annual Hulaween in the Big Easy event in what looked like a Dolly Parton getup.
Martha Stewart  attended the Hub Network's Halloween  Bash in LA as Glinda the Good Witch.
Miranda Kerr  dressed up as a cat, while her son Flynn went as Superman.
Kelly Ripa  and Michael Strahan were Miley Cyrus  and Robin Thicke for Halloween .
Kelly Ripa  and the Live With Kelly and Michael team also dressed up as characters from Sons of Anarchy.
Seth MacFarlane dressed up as a Civil War soldier for Halloween .
Kate Upton wore face paint and a fancy dress to an LA Halloween  party.
Josh Duhamel  shared his spectacular Day of the Dead costume with Fergie  on his Instagram.
Snooki was dressed to the nines as a snow queen  of sorts at her Night of the Living Drag event with JWoww.
Matt Lauer dressed up as Pamela Anderson from Baywatch.
Miley Cyrus  dressed up as Lil' Kim from the 1999 VMAs.
Snooki and JWoww opted for a costume change at their Halloween  event, switching it up as Tweedledee and Tweedledum.
Shenae Grimes dressed as Poison Ivy from Batman at the Midori Green Halloween  party in LA.
Gisele Bündchen dressed up as Dorothy, while Tom Brady  donned a cowardly lion costume at a private holiday bash in Rhode Island.
Kelly Brook went to the Casamigos Halloween  Party as a bloody Marie Antoinette.
Christina Milian stood out at the Midori Green Halloween  party in LA, despite wearing a camouflage ensemble.
The Good Morning America team all donned costumes for Halloween .
Julianne Hough dressed up as Crazy Eyes from Orange Is the New Black for the Casamigos Halloween  Party, and she later apologized for her costume .
Vanessa Hudgens  had an interesting take on an angel for the Casamigos Halloween  Party.
Lauren Conrad  kept it simple as a fairy for a Halloween  party in LA.
Stephanie Pratt opted for an I Dream of Jeannie throwback at the Casamigos Halloween  Party.
Jenna Ushkowitz channeled a Top Gun fighter pilot at the Midori Green Halloween  party in LA.
Josh Duhamel  and Fergie  dressed up as Riff Raff from Rocky Horror Picture Show and Elvira for a party in LA.
At the Casamigos Halloween  Party, Hilary Duff  showed up as a mouse. Duh.
Neil Patrick Harris  and David Burtka took to Instagram to post their Alice in Wonderland group costume!
Nicky Hilton  went with a classic schoolgirl costume for the Playboy Mansion Halloween  party.
Adam Lambert  went totally goth for a Halloween  party in Hollywood.
Willie Geist and Carmen Electra  teamed up for Baywatch costumes.
Jesse Tyler Ferguson and Justin Mikita went to a Hollywood Halloween  party as Batman and Robin.
Kristin Chenoweth  dressed as a S.W.A.T. team member and posed with a Storm Trooper in LA.
Derek Hough looked like he was shooting for Billy Idol at the Casamigos Halloween  Party.
Carson Daly and Erik Estrada donned CHiPs outfits.
Ahna O'Reilly wore a mask for a Halloween  bash in LA.
Brody Jenner channeled the Day of the Dead vibe for the Casamigos Halloween  Party.
David Spade went to the Casamigos Halloween  Party as Terry Richardson.
Adam Lambert  dressed as a genie for an event benefitting the Gay Men's Chorus of LA.
Alessandra Ambrosio went to the Casamigos Halloween  Party as a sexed-up Queen of Hearts.
Modern Family's Rico Rodriguez showed up at the Hub Network's Halloween  Bash dressed as a zombie.
Isla Fisher  and Sacha Baron Cohen 's costumes for the Casamigos Halloween  Party were way out of left field.
Ryan Seacrest  haunted the Casamigos Halloween  Party as the Phantom of the Opera.
John Stamos looked devilishly handsome as a demon at the Casamigos Halloween  Party.
We're guessing Michelle Trachtenberg 's costume for the Casamigos Halloween  Party was something along the lines of a black widow.
Molly Sims looked like she was aiming for a Chiquita Banana costume at the Casamigos Halloween  Party.
Cindy Crawford  and her husband went as Guns 'n' Roses bandmembers Slash and Axl Rose to the Casamigos Halloween  Party.
JWoww went all out as the Queen of Hearts at the Night of the Living Drag event she hosted with Snooki.
Jessica Alba  channeled Cher's character from The Witches of Eastwick.
Dave Walton was the phantom of the opera.
Bethenny Frankel wore a colorful getup for Halloween .