The outing comes days after the pair were seen getting close at her sister Margaret Qualley's wedding to Jack Antonoff over the weekend
Qualley held hands with Ritchotte, 31, as she wore a patterned black mini dress and black boots, with her hair hanging loose over her shoulders.
The former Portugal. The Man drummer went casual in khaki pants, a white tee and sneakers, finishing the look in a baseball cap and black sweatshirt slung around his shoulders.
Seemingly confirming their relationship, Ritchotte posted a photo on his Instagram Story Monday of the pair, with Qualley wearing a hot-pink dress of a similar length as they held hands and walked down the street.
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Reps for Qualley and Ritchotte did not respond to PEOPLE's requests for comment Tuesday.
Qualley shared a series of photos on Instagram from the red carpet at the time, saying she "can't wait" for viewers to "fall in love with" Lewis' character, Bob.
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