Get ready, American Horror Story fans -- Lady Gaga is about to completely haunt our nightmares.

Ryan Murphy couldn't stop gushing about his new leading lady on the red carpet at the 2015 Emmys, where he told ET's Nancy O'Dell that the pop star is bringing new levels of sex and gore to the series' upcoming fifth season.

WATCH: The Full 'AHS: Hotel' Trailer Is Here and Lady Gaga Is Terrifying! 

"Her introduction is a six-minute [scene] -- almost like a silent movie with no dialogue, and lots of blood and nudity," he spilled. "We started shooting on one of our first days, and you always want to throw people in with sort of an easy scene and she said, 'No, let's go for it.' So, it's pretty phenomenal and I think she'll surprise -- in a great way -- a lot of people."

Murphy revealed that the pop star has fully committed to her creepy new role, even showing up to set "two hours early" in order to prepare for her scenes.

"I have to say, she's one of the great professional joys in my life," he confessed. "She has been such a team player, the cast and crew is obsessed with her. Her performance is amazing. She's a great actress."

NEWS: Lady Gaga Keeps Her Vampire Children on Tight Leashes In New 'AHS: Hotel' Promo

As ETonline previously reported, Gaga will play The Countess in AHS: Hotel -- the blood-sucking owner of the fictional Hotel Cortez in Los Angeles, who engages in polyamorous, bisexual relationships with Matt Bomer, Angela Bassett and Cheyenne Jackson.

Bomer had similar sentiments about his co-star when he caught up with ET at the iHeartRadio Fest in Las Vegas over the weekend. "I've had one of the best creative experiences of my career getting to work with Lady Gaga and the incredible cast," he said.

"[Lady Gaga is] very creepy and scary, but in a very emotional way, which I like," Murphy added. "I think this season of all of them feels like our most modern season, it's definitely our most sexual season. It all starts with that lead actor, which she is for us, and she doesn't not disappoint -- I'll tell you that much."

Hotel also marks the show's first season without Jessica Lange, but rest assured that AHS vets Sarah Paulson, Evan Peters, Denis O'Hare, Lily Rabe and Kathy Bates are among the many returning cast members. And we wouldn't be surprised at all if Murphy had a few more unexpected appearances in store for this year. So, who would be his dream guest star?

"I always keep joking that I'll get Julia Roberts to come on there one day, 'cause she's a friend," Murphy cracked. (Count us in!)

NEWS: Lady Gaga's 'AHS: Hotel' Lovers Tell All!

American Horror Story returns to FX on Oct. 7. In the meantime, get caught up on everything we know (so far!) about Lady Gaga's sexy new role in the video below.