It looks like Belle Knox, the Duke University student and porn star, is developing a close friendship with another X-rated star she's been working with.

Belle Knox Posts Seductive Classroom PHOTO

Knox made an adult film with her co-worker Lisa Ann, and it appears they've been spending a lot more time together. On Knox's Twitter page, random moments can be seen of the actresses together, including a photo where they stand in front of a wall that has art for the children's game Candyland.

Not only are they going places together, they're also spending nights in doing typical friend stuff. Knox retweeted Ann's post on how they hang out indoors.

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"Chillin at the hotel w @belle_knox we rented a movie, ordered room service, she is playing with teen things on her phone, I am reading ESPN," Ann wrote on Saturday.

That same day, Ann posted a photo with her co-worker and friend as they wear dresses and look like they're going out for a good time.

"headed out with @belle_knox," Ann wrote in the caption while adding in heart emojis.

The two X-rated performers worked together in the adult film "Porn 101 The Education of Belle Knox." Knox told XBIZ TV how Ann is a great performer and how her support is helpful.

"I feel like I'm growing both as a person and as a performer, and she's really helped me a lot and she's opened my eyes to all the opportunities that's here for me so I feel really blessed," Knox said.