Happy Halloween!Check Out 22 of the Best Costumes Ever Worn by Celebrities!

Model Heidi Klum gave us a glimpse of the future at her 2013 Halloween Party in NYC. The gorgeous star is known for her lavish costumes every year, previously dressing up as a very life-like gorilla and even a Hindu goddess with six arms!

Al Roker channeled his inner Mr. T for the Today Halloween special last year.

Whoa — is that you, Ellen Degeneres!? The daytime talk show host looked almost unrecognizable in this Nicki Minaj-inspired getup last Halloween.

Larry David and a friend were attached at the hip as Siamese twins at the Casamigos Halloween Party in October 2013.

Mom-of-three Kelly Ripa donned this stylish astronaut costume (accessorized with high-heels, of course!) while taking kids Lola and Joaquin trick-or-treating in NYC last October.

Just one year ago, Martha Stewart did her best impression of Glinda the Good Witch from The Wizard of Oz in this fun costume!

Actress Liv Tyler was all smiles while trick-or-treating in NYC with her son, Milo, and mother Bebe Buell in 2010.

What an incredible family! Actress Jessica Alba, her husband, Cash Warren, and their daughter Honor dressed up as super-family The Incredibles in 2012.

It was an "Alice in Wonderland" kind of Halloween for Neil Patrick Harris and partner David Burtka in 2013! The duo put on their finest Twiddledee and Twiddledum gear while twins Gideon and Harper dressed up as the rabbit and Alice…

…and it was also a spooky kind of Halloween for the fam! This time the fearsome foursome went for scary instead of fantasy. Neil dressed as Frankenstein, his partner, David Burtka, went as Dracula, and their twins, Harper and Gideon, took on the bride of Frankenstein and the Wolfman.

Pictured here in 2013, TV personality Ryan Seacrest channeled The Phantom of the Opera while attending a Halloween party in LA.

Is that the duo we think it is? Yep, it's Melissa McCarthy and Sandra Bullock, who took their children trick-or-treating in LA together last year. Talk about the perfect disguises for two high-profile stars!

Bet you never thought you'd see this! Matt Lauer as Pamela Anderson in "Baywatch" — complete with his own beach and iconic red swimsuit! Let's just say the Today Halloween special was extra special last year.

Flintstones, meet the Flintstones! Today show hosts Kathie Lee Gifford and Hoda Kotb dressed up as Wilma and Betty from the animated sitcom on the show's 2013 Halloween special.

Haaaave mercy! John Stamos showed off his devilish side at last year's Casamigos Halloween party.

Something was fishy in 2013! Ah-ha — it was Patrick Stewart as a lobster!

Kelly Ripa made Miley Cyrus proud when she took a shot at recreating the twerker's infamous 2013 MTV VMAs outfit for the Live With Kelly and Michael Halloween special last year. And co-host Michael Strahan made quite an awesome Robin Thicke (or Beetlejuice — whichever way you want to look at it)!

Last year, Today anchors Natalie Morales and Savannah Guthrie decided to pay homage to Laverne and Shirley from the popular '70s sitcom as part of the program's annual Halloween special.

Yep, it's Tim Allen under that helmet! The actor rocked a Detroit Lions football costume to a 2013 Halloween party in Beverly Hills.

They brought 1987 to 2013! Cindy Crawford and husband Rande Gerber channeled Guns N' Roses' Slash and Axl Rose.

Actor Erik Estrada didn't have to dish out too much moola for his 2014 getup! He went as his "CHIPs" character, Officer Frank Poncherello, while newest Today show host Carson Daly dressed up as Pocherello's boss, Sgt. Joseph Getraer.

Where did that bump come from?! Comedienne Chelsea Handler wore a fake baby bump while attending Kate Hudson's Halloween party in Brentwood, Calif., in 2013.