The new couple was spotted on a romantic stroll in Paris on July 6, where the duo walked hand in hand and later split an ice cream cone.
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In a blue print dress and sunglasses, Dianna appeared happy without a care in the world as she walked through the most romantic city in the world, where Winston's band is playing a gig on July 7.
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Us reports that Dianna has been a fan of the band for a while but "she's not exactly bragging about their relationship just yet."
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In the past, Winston has been linked to Katy Perry and Dianna has been spotted getting cozy with Jennifer Lawrence's ex-boyfriend Nicholas Hoult.