It's Comrade Ri Sol-ju.

Suddenly identified as the wife of Kim Jong-un.

A singer with the same name has starred in several concerts in the past – in one case, performing a song with the apt title Do Not Ask My Name. But she is not the singer previously rumoured to have been Kim's companion, Hyun Song-wol, known for her hit Excellent Horse-like Lady.

There's some ear-shattering audio at all 3 of those links. I was alarmed at the first link by the forceful vocalizations of the female news reader.