I love how it looks like Brad put a lot of thought into his costume while Angelina had a 5-minute DIY look.

I love me anything related to Alice in Wonderland so this costume is a WIN for me. She said that she tried to dress Harlow in a costume related to the story too but the little girl set her sights on Tinkerbell.

Is it just me or does Gwen look like she could play the real life version of Jessie?

I seem to be liking costumes that are kid-related and this one is no different. Now if only Jessica's husband did not go as Dora's cousin...

Mariah was the angel in a tight corset, of course. I am aware that they probably chose the costumes as part of the promotion of her latest album, Imperfect Angel, but you have to admit that Mariah's hair does look like it is always blown using the hairdryers in heaven.

Because the best way to get the most out of store-bought costumes is to look super-cute in them.

I will have to say that this is the BEST COSTUME EVER. I am a big fan of that evil baby. My admiration for Kelly has officially increased tenfold.

Seal and Heidi Klum dressed up as Ravens for their annual Halloween party. I was hoping to see Heidi in a form-fitting dress because I wanted to gawk at her body after she gave birth but this fun costumeis enough. I love how it seems that she hires the best craftsmen for her costume every year.

AKA the Hannigan-Denisof family. A photo of them sans costume is always cute but this is a delectable icing on an already yummy cake.

While most celebrities would choose to show off their curves in revealing costumes, Katy Perry decided to embrace Halloween fun without worrying about flattering photo ops.