The 17 worst celebrity Halloween costumes of all time

Julianne Hough received a lot of backlash when she donned blackface to portray "Crazy Eyes" from TV show "Orange is the New Black."

"It certainly was never my intention to be disrespectful or demeaning to anyone in any way," Hough wrote later, according to the Huffington Post.

Isla Fisher allegedly intervened when she saw Hough's outfit, though Fisher's rep denies this, according to Us Weekly.

Let's not forget the time Prince Harry thought it was a good idea to dress as a Nazi.

He later apologized.

Or when Chris Brown went as a terrorist.

While many found Heidi Klum's Kali costume to be beautifully intricate, many more found it incredibly offensive to Hindus.

Hilary Duff and Jason Walsh dressed up as a Native American/pilgrim duo.

Duff and Walsh later apologized for the poor decision.

But costumes don't need to be offensive to be bad. They can just be lazy, like when all Ryan Seacrest did was wear a mask.

Christmas in October? This sexy Santa costume was just weird.

Lea Michele's costume as a German beer girl lacked creativity, too.

We don't even know what Fergie was going for with this look.

Paris Hilton went as a bunny, we think? She's really just in her underwear.

Perez Hilton's Miley Cyrus costume might be a bit too over the top. The fangs are also confusing.

Britney Spears' Snow White costume looks like a basic costume you can pick up at any store. We'll give her credit for adding dwarfs though.

Jason Biggs' Dorothy outfit is slightly creepy, but at least he went all out. The basket is a nice touch.

We don't know what Hailey Duff is trying to be here.

John Stamos' Halloween costume was only some face paint and horns. Try a little harder next time.

Colton Haynes' Miss Piggy costume was creative, but unsettling.

Many people called out Ashley Tisdale's Sugar Skull costume for cultural appropriation.

Sugar skulls are part of Mexican culture, and Tisdale angered fans by dressing as one.