Happy Halloween! A Look At Celebrities In Costumes

Sarah Michelle Gellar's daughter Charlotte was adorable in her Dorothy from the 'Wizard of Oz' costume!

Christina Aguilera & her son Max looked spook-tacular in their skeleton costumes.

Kate Beckinsale & her daughter Lily Mo always have the best costumes every year!

Lily Mo looked so cute with her dad, 'Twilight' actor Michael Sheen.

Chris Noth got into the Halloween spirit and dressed up like Buzz Light Year!

Brooke Burke & her caped crusaders hit the red carpet last Halloween!

Britney Spears' boys were spotted trick-or-treating in their cute costumes last Halloween.

When she was pregnant with Seraphina, Jennifer Garner & Violet dressed up as Ted & Fred dogs!

The cutest kangaroos! Alyson Hannigan & Alexis Denisof got into the spirit with their daughter Satyana!

Harrison Ford & Calista Flockhart always love dressing up with Liam.

Greatest costume ever? Harrison Ford looks hilarious as a pea in the pod!

We love this costume on Jessica Alba's daughter Honor Marie.

Now that she's all grown up, Honor Marie loves wearing princess costumes!

Who could forget these great pics of the Jolie-Pitts out trick-or-treating in the Hollywood hills?!

Kourtney Kardashian & Scott Disick took Mason out trick-or-treating in a bee costume.

Anthony Kiedis & his son Everly Bear looked spook-tacular in their Halloween costumes.

Kimora Lee Simmons & her kids looked fabulous last Halloween.

Marcia Cross & her twins always enjoy the Halloween season.

Katherine Heigl's hubby Josh Kelley was spotted with their festive fairy last Halloween.

Mary Lynn Rajskub & her boys got festive with their fun costumes.

Gwen Stefani & Gavin Rossdale were pictured with their lil' pumpkins.

Brooke Shields & her girls love going trick-or-treating in the Big Apple.

It's a Snooki bump! Melissa Rycroft & hubby looked so cute in their 'Jersey Shore' costumes.

Tori Spelling & Dean McDermott got festive with their kids last Halloween season.

Jon Stewart & family hit the streets of NYC in their costumes last Halloween.

Liv Tyler & her son Milo love to get dressed up at Halloween.

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Happy Halloween!

In the spirit of pumpkin carving and trick-or-treating today, we're continuing with the Halloween celebrations and taking a look at some festive costumes. From Harrison Ford's pea in the pod get-up, to Alyson Hannigan's kangaroo cuties, to Katherine Heigl's festive fairy, let's take a look at some of our favorite Halloween costumes of the celebrities and their kids over the years.

Who's your favorite costume cutie?