It's officially spooky season! Halloween is today and many celebrities have celebrated all week long and posted their costumes to Instagram. We didn't know how many people take the occasion so seriously but we sure love to see what they come up with! Let's take a look at some of the best costumes so far... 

Kevin Hart channels iconic 'The Rock' fanny pack picture

Ellen dresses up wig and all on The Ellen DeGeneres Show

Kylie Jenner dresses up as "Ariel" and looks stunning

Jessica Biel dressed up as her husband Justin Timberlake during his NSYNC days

Gabrielle Union and her daughter dressed like twins from Bring It On

Jessica Szohr channeled "Sandy" from Grease

Demi Lovato LOVES Halloween

Kylie Jenner's daughter Stormi dressed up in her mother's Met Gala look

Vanessa Hudgens is obsessed with Halloween

What happens when genetic experiments go wrong?

'Hawaii Five-0' Star Jorge Garcia Gets Into The Halloween Spirit!