Our team of designers faced all the fugly troubles of the high school cliques in order to put together this perfect (and officially licensed) Mean Girls costume featuring everyone's favorite Karen Smith's "I'm a Mouse!" costume!

Women's Mean Girls Karen Smith Adult Mouse Costume Dress - Fun and Flirty Halloween Outfit for Women

Women's Mean Girls Karen Smith Adult Mouse Costume Dress - Fun and Flirty Halloween Outfit for Women

Check out our mean girls mouse costume selection for the very best in unique or custom, handmade pieces from our costumes shops.

You can embody a charming mouse, a fierce Mean Girl, a whimsical weather reporter, a touch of psychic wit, and an overall adorable persona when you don this exclusive Karen-inspired Mousey costume from **Mean Girls**.

Get ready to bring your favorite Mean Girls character to life with this Karen Smith "I'm a Mouse, Duh!" Women's Costume! This fun and playful outfit includes everything you need to channel Karen's quirky and lovable style.

Check out our karen smith mouse costume selection for the very best in unique or custom, handmade pieces from our costumes shops.

It's time to unleash your inner Mean Girl and transform into the iconic Karen Smith with our exclusive "I'm a Mouse, Duh!" Costume. Made with 100% polyester, this costume is the perfect blend of sass and style, just like Karen herself.

Women's Mean Girls Karen Smith Adult Mouse Costume Dress - Fun and Flirty Halloween Outfit for Women