nicolerichiehalloween230.jpgIs it too late to change costumes?

Reformed wild child Nicole Richie has made a public plea to girls everywhere asking them not to "dress slutty" for Halloween this year.

The 30-year-old mamma of two posted on her Facebook page Thursday:

    "Girls, can we all pledge that we will not dress slutty for this Halloween? The jig is up!"

Ever since Richie married Joel Madden and became mom to Harlow, 3, and Sparrow, 2, she dresses much more conservatively, and has kept her Halloween costumes very "G" rated.

Last year Richie went as Jessie from Toy Story, in 2010 she went as Margot Tenanbaum from The Royal Tenanbaums, and in 2009 she kept it covered up as the White Rabbit from Alice in Wonderland.