Actress Jennifer Lawrence at the BAFTA 2018 Awards in London. Photo / AP

Jennifer Lawrence reveals fears over her first ever nude scene - admitting she berated crew for making the set too warm before filming.

Jennifer Lawrence has opened up about one of her biggest concerns about doing her first nude scene: the appearance of her nipples.

The 27-year-old actress made the candid confession during an appearance on Ellen DeGeneres's talk show, admitting that she was so focused on how her nipples might look that she actually berated the crew after they made the set too warm.

After the 60-year-old TV host asked why Jennifer had chosen to take the plunge and do her first nude scene after vowing never to go naked on camera, the actress not only explained her motivation, but shared why she was so concerned about her "nipples looking huge" as a result of the hot temperatures.

Ellen opened up the conversation by gushing about Jen's new action-packed spy movie

Red Sparrow

, which was officially released on March 2, noting that she and her wife Portia de Rossi loved the thriller.

She then questioned Jennifer about her nude scene, asking what it was that had made the actress decide to strip down on camera for the very first time, after she previously insisted that she would never go naked in a movie.

"I think I finally just got hot," Jennifer laughed, while sipping on a rum cocktail and laughing.

Then, more serious this time Jen shared, "To me it was really just an amazing script and story.

"I loved the character and I just didn't want to miss out on it because of like my weird insecurities so I did it and it was really lovely."

Jennifer continued saying what made her feel much more comfortable was the fact that the entire crew was from Hunger Games which she thinks made it better.

She explained the scenario of the day she had to film her naked sex scene saying the crew were all really nice and they all went in at three in the morning to set up heaters.

Pointing out the fact that the weather was freezing "because it was a very Hungarian winter" she admitted that she was always complaining about being cold.

So, the day of she finally gets to the set and walks into the room and said it was so warm and toasty when all of a sudden she started screaming in an aggressive manner, "What are you doing with this heat! My nipples are going to be huge!"

Her an Ellen started hysterically laughing and Jen said that that everyone started freaking out when she was yelling and they didn't know what she wanted.

She joked that the crew said, "Jen you can't diet anymore."

While the actress was able to joke around with Ellen, the fact that she went naked for the movie was a much bigger deal to her than anyone else realizes.

Jen shared in the March issue of Vanity Fair that because going nude was her choice and not someone else's, she felt "empowered."

Not only did she speak up recently, saying being nude "empowered" her, she also addressed all of the backlash she received when she chose to wear her gorgeous black Versace dress with no coat in the cold.

People were bashing JLaw for stepping out in her black gown which showed off a ton of cleavage and she had some choice words for those people on a recent radio interview on

The Howard Stern Show

.

She said of taking pictures without a coat at the London photocall, "I saw the cameras for the photo call and I walked my bare a** out there for the photos nobody took a coat from me."

Continuing her amazing rant she said, "It was a fabulous dress I wasn't going to cover it up in a f*****g coat.

"Also, I shoot in below freezing weather in record-breaking winters, I can stand outside for 90 seconds in a dress."

The actress even went so far to say, "All these people trying to be feminist, you're not you're loud, you're annoying, you have no point and what you also do, you make people hate a movement."

Aside from Jennifer talking about her nipples, she also hilariously brought up that she has an alter ego named Gail that only comes out when drinking rum so Ellen brought out a full tray of cocktails after hearing that.

Jennifer pretended not to be phased by the plethora of alcoholic beverages but quickly picked up the pink rum punch and gulped it down.

Jennifer laughed and told Ellen, "I'm really not this big of a drinker. But when I'm on a press tour I drink a lot."

The actress went on to reveal that Gail enjoys putting her life in danger and explained a time she jumped in shark-infested waters while on vacation with friends.

Jennifer said, "Gail is lovely. She has a heart of gold."

Ellen then showed the audience a picture of a bikini-clad Jennifer in her alter ego form smiling awkwardly at the camera and JLaw joked, "There she is. There's my girl."

Explaining why her face looked like that she said, "Look I was trying to look cute I was getting photographed with all my girlfriends on the beach."

Ellen replied saying that the picture doesn't even look like her and is a totally different face and smile and Jen started laughing about it saying, "The hair too – just so presidential."

Finally, Jen gave us all the rundown about the alter ego when she said, "I'll just give you five seconds of Gail.

"So from there," she said while pointing to the picture of Gail, "we went conch diving. We pull up the conch and the guy driving our boat goes "look they all have little worms."

"I took it out of his hand and swallowed it and then pulled the worms out of all the conchs and swallowed all the worms and some of my friends are kind of laughing but they were like, "hello" waving in my face.

"Then we pull up and he's like this is where the fishermen clean all the fish out so there's all these sharks here and I was like "SICK" in a manly voice and just jumped in.

"Everyone was like somebody get her some water and coffee she's gonna die.

"It was just like one masculine, aggressive, adrenaline junkie thing and I'm like normally pretty cautious.

"I've never really broken a bone and then I get rum in me and I'm like let's arm wrestle."

Ellen then went on to ask if Jennifer's alter ego was the same person who attended the Red Sparrow New York Premiere.

A photo of wide-eyed J.Law was projected on the screen which made the star cringe, spit out her drink and run away from the audience screaming, 'NO!'

"Please take her away! Oh my god," Jennifer exclaimed.

Ellen asked the blonde beauty, "That's not Gail, right?"

The star replied, "No, that's someone else, I just met her the other night. I feel like her name ends in a 'e."

Jennifer told the host she was drunk at the premiere and tried to pose on the red carpet with a sober face, but ended up humiliating herself.

Ellen continued to poke fun of the Kentucky native: "It probably would have been better to just pose drunk."

Jennifer's thriller spy film, Red Sparrow, is released in theaters today.