The announcement was made at an exclusive ceremony hosted by BBC Radio Wales DJ Adam Walton this evening at Cardiff's Kuku Club,.
Rhys said: "Everyone on the list deserved to win, so I am very grateful.
"I really didn't expect to win, so I didn't prepare anything."
Welsh Music Prize co-founder and SWN Festival organiser John Rostron added: "To have all of the shortlisted acts attend this inaugural Welsh Music Prize speaks volumes of the interest that this idea has ...
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