Good Morning America Hilary Duff Apologizes for Controversial Halloween Costume

The actress, along with her boyfriend Jason Walsh, dressed up as a pilgrim and Native American, respectively. The two were attending the annual Casamigos Halloween party in Los Angeles Friday.

Inside Kate Hudson's Annual Halloween Party

How Stars Celebrated Halloween This Year

Netflix Halloween Movies: What to Watch if You're Not Trick-or-Treating

"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," she tweeted Sunday.

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.

— Hilary Duff (@HilaryDuff) October 30, 2016

Walsh also offered an apology.

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

Native American costumes have long drawn the ire of indigenous people, who believe their culture is being appropriated by others.
WATCH: College Students Warned Against Offensive Halloween Costumes

College Students Warned Against Offensive Halloween Costumes

Sorority and fraternity leaders at Tufts University wrote in a letter to chapters, "there are consequences for wearing an offensive costume."