'I am SO sorry to people I offended with my costume,' she wrote on Twitter
Credit: Michael Kovac/Getty Images

UPDATE: Hilary Duff later apologized in a tweet sent out Sunday. “I am SO sorry to people I offended with my costume,” she wrote. “It was not properly thought through and I am truly, from the bottom of my [heart] sorry.”

ORIGINAL STORY: This article originally appeared on PEOPLE.com.

Hilary Duff has managed to have a fairly drama-free life in the spotlight — until now.

The former Disney darling and Younger star, 29, stepped out for her first public event with her new boyfriend, trainer Jason Walsh. And people were less than thrilled with their couple costume: He wore a headdress and face paint as a Native American “chief “and she dressed as a sexy pilgrim.

Many fans took to Twitter to share their feelings about Duff and her new beau’s costume choice, especially in light of the ongoing Dakota Access Pipeline protests. Protesters say the pipeline threatens the local water supply and destroys sacred Native American sites, particularly those of the Standing Rock Sioux Tribe.

Protests aside, Native American costumes are generally considered a risky Halloween choice as many people view it as an offensive appropriation of their culture. (Chris Hemsworth even recently apologized for wearing a Native American costume while attending a New Year’s Eve party, saying he was “stupidly unaware” of the offense it would cause.)

Duff confirmed her relationship with Walsh earlier this month, when she shared an Instagram photo of the couple smooching with the caption, “Date night with J.” But romance rumors first started last summer after the two were seen partying together following the grand opening of his Rise Nation Fitness Studio in West Hollywood.

In an interview with Fox 5’s Rosanna Scotto, Duff said, “We’ve known each other for a really long time and he’s a great guy and we have a lot of fun together,” said Duff. “It’s nice to have that excitement in my life.”

Reps for Duff and Walsh did not immediately respond to a request for comme