The super glamorous star, 66 - formerly known as Bruce Jenner - has unveiled her new campaign in support of transgender communities.
Caitlyn and Mac confirmed the partnership on Friday night (26 February) by sharing a new promo image in which she oozes class in a STUNNING gold gown. We have serious frock envy!
Alongside the image, she told her 6.1million Instagram followers: "I'm finally free to announce my partnership with @MACcosmetics! All sales of our lipstick shade, Finally Free, go toward improving transgender communities. Look for it in April! #MACCaitlynJenner."
Mac also spread the good news, tweeting: "All Ages. All Races. All Sexes. #MACCaitlynJenner online in Apr. Info here: http://bit.ly/MACCJ @Caitlyn_Jenner."
Caitlyn, who used to be married to Kris, has collaborated with the cosmetic brand on a rose lipstick called Finally Free, which will be available exclusively online from 7 April.
All of the profits from the product will go to the Mac AIDS Fund Transgender Initiative to support its work in support of transgender communities.
In a statement on their website, Caitlyn admits working with Mac is her "ultimate fantasy" adding: "Mac was the first to come to me, and a company, I realised, would really make a big commitment.
"I knew the Viva Glam campaigns; I saw that the proceeds were going, in those cases, mainly to AIDS and HIV causes, and I was wondering if they were interested in doing something specifically geared toward trans issues because we need funding.
"Mac is a global company. It's in places around the world where not just trans issues, but women's issues, are a major subject that you have to talk about."
About Caitlyn, the brand said: "Her beautiful transformation inspires all of us to live our best lives and to honour who we are. Differences are what make us interesting. Acceptance, warmth and understanding are what make us human."
In the past, Rihanna, Nicki Minaj, Lady Gaga and Pamela Anderson have all released their own lipsticks with Mac.
Meanwhile, the second series of Caitlyn's reality show I Am Cait premieres on 6 March at 9pm on E!.
She will also be releasing a memoir in 2017.
See the trailer for season two of 'I Am Cait' below:
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