Ruby Rose, the smoking new star of "Orange is the New Black" ... is breaking the hearts of all the men and women drooling over her -- by flaunting her fiancee around town.
Rose and Phoebe Dahl -- who got engaged a few months ago -- arrived back in L.A. on Wednesday after hanging in NYC for the 'OITNB' Season 3 premiere.
Aussie native Rose is getting a ton of attention for her striking looks -- and sure enough, fans hit her up for pics when she and Phoebe went shopping.
A striped shirt and a ball cap would be "dressing down" for most people ... but most people don't look like Ruby.
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