Another Halloween, another celebrity apologizing for an offensive costume.

Hilary Duff and her boyfriend, trainer Jason Walsh, received a lot of backlash this Halloween for dressing up as a pilgrim and a Native American, respectively (but notrespectfully).

SEE ALSO:Attention '90s Disney fans: 'Halloweentown' is actually a real placeBEVERLY HILLS, CA - OCTOBER 28: Hilary Duff and Jason Walsh attend the Casamigos Halloween Party at a private residence on October 28, 2016 in Beverly Hills, California.Credit: Michael Kovac/Getty Images for Casamigos Tequila

A few hours before the party, Duff shared a photo of herself with the gun she ordered for her costume on Twitter and Instagram.

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"Sooooo the fake gun for my pilgrim costume came. Don't think it's quite big enough," she wrote. If only she'd taken that as a sign that they shouldn't go forth with their costumes, we could have avoided this whole mess...

Some predicable social media backlash ensued once photos of their costumes emerged.

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But there were also some people who defended the costumes.

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Duff and Walsh posted apologies online yesterday.

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"I am SO sorry to people I offended with my costume. It was not properly thought through and I am truly, from the bottom of my ❤️ sorry," tweeted Duff.

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"I meant no disrespect. I only have admiration for the indigenous people of America," Walsh wrote on Instagram. "In hindsight I would not have made that decision. I apologize to anyone I may have offended."

I guess the tiny cartoon Lizzie McGuire conscience that lives in Duff's head was on vacation this Halloweekend.

BONUS: Hamster Potter