Jessica Simpson's Halloween costume is scary sexy!

The singer, who has reportedly dropped 60 pounds since joining up with Weight Watchers, flaunted her amazing figure in a very tight-fitting wench costume.

With some killer cleavage and hot new extensions, Jessica looked great alongside fiance Eric Johnson (in a Braveheart costume) and their baby daughter, Maxwell ... who was dressed as the most adorable rooster ever.

Jessica's costume is a far cry from the one she wore last year, when she finally confirmed she was pregnant by holding onto her belly while dressed as a mummy. Mummy, mommy ... get it?

It looks like Simpson's diet and workout regime are really working for her though ... and she's got one good looking family!

Happy Halloween everyone -- check out more celebrity costumes in the gallery above!

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