The "Twilight" star was first linked to Cara Delevingne's musician ex in August, when they attended a screening of Stewart's movie Certain Women together.
However, the new pair chose the CFDA/Vogue Fashion Fund Show and Tea event at the Chateau Marmont in West Hollywood as the perfect occasion to officially debut their fledgling romance, reported Vogue.
Stewart looked chic in a black blazer and baggy Phillip Lim joggers with black loafers, while St Vincent opted for a cropped red and black jacket with high-waisted black trousers.
St Vincent, real name Annie Clark, split from model/actress Delevingne over the summer after more than a year together.
The relationship news comes just days after Stewart opened up about her love life in a candid interview with a magazine for its Women in Hollywood issue, insisting she isn't "ashamed" or "confused" about her sexuality.
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