Over the past year, Meghan Trainor has made body confidence part of her platform. It started with her debut hit "All About That Bass," which broadcast its message loud and clear: "every inch of you is perfect from the bottom to the top." Body anthem "Close Your Eyes" followed.

Now, Meghan's taking the spokesperson role on in a more official capacity, joining Fullbeauty.com, a e-retailer for clothing sizes 12+, as the face of its #OwnYourCurves print and video campaign. ELLE.com has an exclusive first look at the campaign, out tomorrow:

In fullbeauty.com's City Chic dress and Ellos jacket. fullbeauty.com

Becoming a confidence idol, "that never was a decision," the 21-year-old tells ELLE.com ahead of the launch. "It kind of just happened." But the conversation around body image, particularly in the fashion industry, fuels her: "I hate seeing when people blow up about a model because she has a little extra skin," Trainor explains. "She looks so skinny and beautiful. I hate that it's like I have to be a big diva, but I like that we're talking about it, and those people are speaking up."

Below, Trainor discusses the campaign, how she really feels about the word "plus size", and the fight against body shaming—hers personally and celebrities' as a whole.

Melissa McCarthy, who just released her own fashion line, talked about how we should retire the word plus size. What do you think of the label?

I've always hated the word "plus-size." It bugs me. When I first signed up with FullBeauty, and I talked to them. I was like, "I don't want to be labeled as this plus-sized girl coming in," and they said, "Absolutely not, we don't like that term either." Which is why we like to say "full beauty" [and] why I was immediately excited to work with them. Everything Melissa said is completely accurate. [They're] a big part of our society, women who are size 14, and how are you going to criticize us? The word "plus-sized" should be gone.

Would you design your own clothing line, like Melissa?

Absolutely. I mean, since becoming a pop star, you go on fittings and put on cool outfits and learn a lot about clothing. Growing up, I wore a lot of sweatshirts and big comfy clothes, but now I've learned how to shape the body and show your favorite parts about yourself. I think I can design something cool and comfy for all sizes. I wear a lot of the skirts and tight tops, and I've noticed girls come to my concerts dressed just like me. They always say "I love this, this is so comfortable and I feel cute."

How do you find your own body confidence?

I work on that every day, every morning! Writing songs really helps. I think a big part of it is saying it out loud. I say, "I look good today," and I feel good. It really helps hearing it out loud.

Is there anyone you look up to?

Beyoncé: Beyoncé has curves, and she loves them. She talks about them. I've always loved that about her. J.Lo's got a booty. It's outstanding. It's unbelievable, even in person. These new girls that are coming out who [are] talking about it—Melissa McCarthy, that model Gigi [Hadid], they're pretty inspirational with their big quotes. I like them.

A big part of it is saying it out loud. I say, "I look good today," and I feel good.

Do you think that their speaking out is helping to change the environment at all, particularly on the web?

I hope so, I really do hope so. I think that bullying will always be a problem now that we have Instagram and social media at our fingertips, but I think if we talk about it more, spread the word, spread the love, try to get more people to love each other, I think that will help. So I like that these girls do that. When big celebrities, people who have power like these women Melissa and Gigi, [do use their voice], I think it gets more people talking about it.

What about you? Have you ever dealt with negativity on social media?

I'll try not to read the comments, especially on YouTube—YouTube has the worst comments. On Instagram, I'll scroll down and see what's going on, and I have little warriors now: These little fans that are yelling at anyone who criticizes me. It's cool because it's not all hate, you know? But there are those comments that are like, "Fat whale, go away," pretty brutal stuff. I just try to not read [it] ... and my family really helps me out whenever I'm feeling down about comments. My mom talks me out of being sad.

What advice would you offer other people struggling with this?

Get that good support system! Talk to your parents, talk to your friends, and the family. I know my friends, if I read something bad, they'll help me out. They're like, "You're crazy girl. You're Meghan Trainor!" You just need good people around you and to not listen to that crap.

With this campaign, do you feel like you're pushing the industry in that direction?

Definitely. I think so and I hope so. Going into stores when I was younger, I couldn't fit into the clothes that my friends were all wearing—tiny teeny stores that were like the coolest thing. I wish I knew what FullBeauty was when I was growing up, and I hope more women hear more about this clothing line. I hope that they feel better and more confident in their own skin.

A lot of people are like, "No, show more skin," and I'm like, "I can be sexy with all these clothes on. Just watch!"

What I love about your style is it's very vintage inspired. Who are your fashion icons?

Marilyn Monroe. I've been watching all her movies lately, and I just think they nailed it. She could be completely covered up, and I still think that she's so sexy. You know, she doesn't have to show every inch of her body, but she rocked it. Even when she had a dress on, she could have a sleeve thing going on, which is my thing. I like having long sleeves, and a lot of people are like, "No, show more skin," and I'm like, "I can be sexy with all these clothes on. Just watch!" So I do like that old school look because I think they were doing it right back then.

Learn more about Meghan's campaign at fullbeauty.com. This interview has been lightly edited and condensed.

Alyssa Bailey News and Strategy Editor Alyssa Bailey is the news and strategy editor at ELLE.com, where she oversees coverage of celebrities and royals (particularly Meghan Markle and Kate Middleton).

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