Maybe it was just a coincidence but both Rihanna and Karrueche Tran wore the same costume for Halloween. Both girls, who have famously dated Chris Brown, were channeling their inner bad girl for Halloween and decided to dress up as "cholas," the Daily Mail reports.

The costume isn't necessarily a popular choice but it seems like Tran came up with the idea first posting pictures of her costume on her Instagram page on Oct. 28.

She captioned one of the photos "Chola" as she posed for the camera with a drink one hand and throwing up a gang sign with the other.

The "Umbrella" singer showed off her look a couple days later posting pictures on her Instagram page on Nov. 1.

"... My chola name was #ShyGirl," Rihanna posted as she too threw up the same gang signs with both hands.

Both girls were dressed in low-slung khaki pants that showed off their underwear and a cropped top worn underneath an open plaid shirt. Rihanna made her look stand out a little more by adding Zombie makeup and a fake tear drop tattoo under her eye.

Posing in some of the photos with Rihanna was Melissa Ford who also dressed up as a chola. Tran also attended another Halloween party in Los Angeles this time dressed up as Aphrodite.

Urban dictionary describes the word chola as "hardcore Latina gangbangers" who usually have thin, arched eyebrows, wear dark red lip liner and a lot of makeup. The style of dress is usually associated with gangs but not all people who wear this style of clothing are associated with a gang. The male equivalent is known as cholo.

This isn't the first time Rihanna and the 25-year-old model have done something similar. At the beginning of September, Tran debuted a new look on Instagram and showed off new bright red hair. The look reminded people of Rihanna's red locks which she debuted in 2010.

The model has since dyed her back to black but recently posted on Twitter that she was ready for another look.

Which "chola" costume do you like better?