Twenty-five-year-old Iskra Lawrence is a multi-hyphenate star: She's a plus-size model, managing editor of Runway Riot, National Eating Disorder Association (NEDA) advocate, and now, an Aerie Role Model.

In her new role for the brand, Lawrence will visit Aerie stores across the country to speak about body positivity. But she's already taken to her Instagram to spread the bodi posi love, specifically addressing the critics who've body shamed her.

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"All the people who said I would never make it because I was too fat to model, all that rejection was actually the ammunition to prove them wrong," the model wrote on Instagram. "I'm proud to be me, healthy and happy because I know I'm more than a size or label. Never let anyone tell you you aren't beautiful. You are beautiful because you are you."

Lawrence told Business Insider that she was dropped by her first modeling agency after being told her hips were "too big."

"I was about 15-16," Lawrence said, "and they just said to me, 'Your [hips are] 36 inches — they need to be 34 at this age. They're too big.' That's just destroying."

Now, the British model is reaping the rewards of success, in addition to spreading a positive message of self-love, which makes her perfect for the #AerieREAL campaign. The inititative has proven that it (literally) pays to be inclusive — since the campaign's launch, Aerie has seen almost a 10% increase in sales.

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"I want to create a lasting impression in the fashion industry," Lawrence told Business Insider.It seems like she's well on her way to doing just that.