Nicole Richie has a message for all her female fans out there — cover yourself up this Halloween!

The 30-year-old mom of two posted a message yesterday on her Facebook page urging girls not to dress inappropriate for the holiday.

"Girls, can we all pledge that we will not dress slutty for this Halloween?" Nicole posted on her Facebook page. "The jig is up!"

Nicole has a three-year-old daughter, Harlow, and a 2-year-old son, Sparrow, and it's great to see her setting the right example for her little ones.

Last year, Benji Madden's leading lady dressed up as Jessie the Cowgirl from the beloved Toy Story films!

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