The I Am Cait star looked sensual and glamorous in a black bustier with tousled curls and makeup as she touched up her lips with the new product while staring in the mirror.

In a move befitting her unofficial role as an ambassador for transgender people, all proceeds from the sale of the Finally Free lipstick will benefit the MAC AIDS Fund Transgender Initiative to support organisations and programmes dedicated to improving transgender lives.

Accompanying the photo, she writes in the caption: "Finally Free Lipstick is here! @maccosmetics 100% of sales go to Trans programs :) link to purchase is in my bio #maccaitlynjenner #finallyfree #transisbeautiful," clearly overjoyed that she can finally share the cosmetic with her fans.

Caitlyn previously revealed the significance the name for her signature shade in an exclusive interview with MAC in February (16).

"I wanted a name that I use and which represents the community. This is who I am: Finally Free," she said. "It's just so simple. No more secrets. I'm free. I woke up the other morning, and I was just happy. Getting dressed, going out, I'm accepted in the world; people are nice. Life is good. I'm Finally Free."

The 66-year-old reality television star chose a colour that was universal, a rosy nude, which could be worn daily, in the hope that it will gain lots of sales.

"I like a little colour on my lips, not a lot during the day. And this rosy nude is the colour I've gone to. To be honest, I want people to use it every day so they have to buy more. I want to raise a lot of money."