Cyrus, 22, was first rumoured to be dating the 24-year-old model last month, after they met through mutual friends. Maxwell has now acknowledged the romance, referring to Cyrus as her partner, on photo-sharing website Instagram, reports femalefirst.co.uk.
Along with a photograph of herself and the “Wrecking ball” hitmaker riding dinosaur statues, Maxwell wrote: “Chillen W my lady @mileycyrus (sic)”.
Cyrus posted the same image of her and her girlfriend, calling Maxwell a “bad a$$ chick”.
She shared: “Bad a$$ day with a bad a$$ chick @stellamaxwell.”
Rumours that the pair had started dating first began circulating last month when Cyrus, who recently came out as bisexual, was seen locking lips with the blonde beauty in a car park close to the set of her new music video in Hollywood.