Megan Fox joins Instagram! Credit: Courtesy of Megan Fox

No filter, and fabulous! Megan Fox joined Instagram and went without makeup in one of her first posts on Thursday, July 3.

"First IG selfie. Early morning no makeup," the fresh-faced 28-year-old wrote. In the photo, the Teenage Mutant Ninja Turtles actress appears to be wearing a white robe.

In November 2011, the mom of two—who looks sexier than ever on the August 2014 cover of Cosmopolitan—broke down her beauty secrets to Marie Claire.

"My definition of beauty is simplicity, elegance and sensuality. Ava Gardner is my beauty icon," she said. "I think that when a woman is in harmony with herself and remains true to her values, she will glow naturally. Femininity doesn't depend on what you wear or how you look. It's an attitude."

"I try to keep my makeup fresh, clean and pretty on the red carpet," she added of her daily routine. "My signature look is red lipstick worn with plain eyes, so I apply a light foundation, then on my cheeks I use blush or sometimes the same lipstick that I'm wearing."