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LOS ANGELES (CBSDFW.COM/AP) – Hilary Duff is apologizing for dressing up as a pilgrim for a Halloween party while her boyfriend put on a headdress and face paint to go as an American Indian.

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Duff and boyfriend Jason Walsh donned the Thanksgiving-themed costumes for a bash in Beverly Hills on Thursday. Duff got a swift social media backlash after pictures from the party were posted online. Many thought the costumes were racially insensitive.

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The actress responded on Twitter Sunday, writing that she was “SO sorry” to people she offended with the costume. She says it wasn’t “properly thought through.” Duff was born in Houston.

Walsh issued his own apology via Instagram, saying he “meant no disrespect” and wouldn’t have made the same decision to wear the costume in hindsight.

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