She says she didn't register that she was bisexual until her early 20s and over the past few years has "slowly been going through the process of coming out".
Beginning by telling friends, then her family, then colleagues, Marvelly confesses she didn't know if those she loved would be accepting and, beyond that, whether she could deal with "the scrutiny of having my sexuality highlighted in the media".
She acknowledges it took time for her to learn that "being true to myself is important for my wellbeing" and that she is "proud" of who she is and wants "to be open about my identity".
Sharing that she "won't be going into any further detail about her girlfriend" she says she is "very happy".
Comments on her post are ones of congratulations for the former classical music singer, praising her as "brave and bold" with many reiterating the phrase "love is love".