"Before, I didn't know what love was - real love," she told . "I didn't understand the depth of it. I always used to think it was you against the world. Now I know the meaning of life is love. Whether that's for yourself or for the world or your partner."
She refuses to be labelled by traditional sexuality categories, saying: "we're all liquid".
"As a child, I used gay as a bad word, as in, 'that's so gay.' All my friends did," she said. "[Her parents] have been so, so supportive. I'm obviously in love, so if people want to say I'm gay, that's great. But we're all liquid - we change, we grow."
Last week, Delevingne fuelled rumours that the pair are engaged after she was seen wearing a ring on her wedding finger. Here's to young love.
The September issue of Vogue is on sale now.
On 26 July 2016, we wrote...
Cara Delevingne and St. Vincent, whose real name is Annie Clark, have been dating for a while now, but it's believed the pair might soon be Mrs & Mrs because Cara has been spotted with a bobby dazzler on her left hand.
The model and actress, who is currently on the promotional trail for her new movie Suicide Squad, uploaded a photo to Instagram and there on her ring finger is what appears to be an engagement ring.
Want to see it more closely?
Just last month it was reported that Cara Delevingne and St. Vincent are buying a US home together.
Cara currently co-own an apartment in Paris with her singer girlfriend - who she has been dating since December 2014 - but with her acting career going from strength to strength, they are keen to splurge on a Los Angeles base.
Congrats to the happy couple (if the engagement news is true).
Hailey Baldwin's HUGE rock might be our new favourite celebrity engagement ring