Millicent "Millie" McFadden (née Huxtable) is a fictional character on the CW television series One Tree Hill, portrayed by Lisa Goldstein. Originally from New York City, Millie was introduced as the personal assistant to Brooke Davis, founder of Clothes Over Bros. When Brooke moved back to Tree Hill, she followed her and helped run the Tree Hill store.

Eventually, Millie would fall for Marvin McFadden, better known as "Mouth", and the two would move in together. For a time, the couple lived in Omaha but returned to Tree Hill soon after quickly. Through several tribulations and a breakup, Mouth and Millie would overcome their differences and marry sometime during the time jump in the series finale.

Millicent Huxtable met Rachel Gatina before while they were both employed by Clothes Over Bros. Working as Brooke's assistant, Rachel, who was a high school friend of Brooke's, modeled for the company. Rachel once made her guard a bathroom door while she was inside with two guys.

Millicent was first introduced as Brooke's assistant at Clothes Over Bros. She goes to Tree Hill with Brooke when she decides to return home and open a store in Tree Hill. She finds it hard to work with Victoria, Brooke's mother, as Victoria dislikes Millicent and is often made fun of. When Victoria is about to ship all the inventory back to New York because the store opening does not cash in as much as first thought, Millicent pays for a couture piece, however Brooke does not cash the check as it will bounce, so instead frames it. Millicent starts a relationship with Mouth.

Millie is still going strong with Mouth in the beginning of season six, but because extremely jealous with the fact that Mouth's new intern is his ex-girlfriend Gigi Silveri, who is now a wild party girl. Millie then finds a picture of Gigi on Mouth's phone, causing her to sleep with Owen Morello (who has an alcoholic relapse). It took some time for Mouth to recover from heartbreak, but they eventually got back together when Skills and Mouth visited New York, with some help from Brooke, who texted Skills Millie's new address. Millie returns to Tree Hill and moves back in with Mouth.

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