You're the mustard to my ketchup. You're the Mario to my Luigi. You're the Princess Leia to my Han Solo. Couples around the country paired up this Halloween in cute matching costumes this weekend. But one couple has people outraged. Actress and former Disney star Hilary Duff has kept a drama-free life, unlike some troubled child stars, until now. The 29-year-old and her trainer boyfriend, Jason Walsh, made their couple debut at a Halloween red carpet event. Duff was dressed as a sexy pilgrim in a leotard. Her boyfriend was a Native American chief wearing a headdress and face paint. People were not pleased to say the least. One Twitter user, @Hahannah14, tweeted," No @HilaryDuff Traditional dress is not a costume and you being dressed as a pilgrim proves to me how insensitive and ignorant you are." 

But @Hahanna14's comment was rated PG compared to some tweets directed to the actress and her boyfriend.

Neither Duff nor her boyfriend have responded to the backlash.

Hilary Duff's Halloween costume is insensitive to some groups

For some, the cultural appropriation couldn't come at a worse time. Thousands of Native Americans are protesting the Dakota Access Pipeline. Demonstrators say the pipeline threatens the water supply for locals and interferes with sacred tribal grounds. Standing Rock Sioux tribal members and others including celebrities like Shailene Woodley have joined protestors. Woodley was arrested during her demonstration earlier this month. 

Hilary Duff isn't the first celeb to wear offensive costume

In 2010, Paris Hilton dressed up as a belly baring Native American for Halloween. Model Heidi Klum is synonymous with wearing over-the-top Halloween costumes. In 2008, she dressed up as Hindu goddess Kali.

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Needless to say, people who practiced Hinduism were not impressed. In 2012, Rihanna hosted a Halloween party and Chris Brown showed up as a terrorist. 

Chris Hemsworth apologizes for wearing Native American costume

Many celebrities are speaking up against the Dakota Access Pipeline including actor Chris Hemsworth. He recently apologized on Instagram for wearing a Native American headdress during a New Year's Eve party.