Kim Jong Un's wife appears in public after a year

North Korean leader Kim Jong Un's wife, Ri Sol Ju, has been shown by state media appearing in public for the first time in more than a year -- a hiatus that had sparked speculation over her health or a potential pregnancy.

She joined her husband at a concert on one of the country's biggest holidays.

North Korea's state-run television channel aired footage on Thursday (February 18) of the pair at the event on Tuesday (February 16) marking the birthday of Kim's late father, former leader Kim Jong Il.

The official ruling Worker's Party newspaper had released photos of the pair at the event on Wednesday.

Ri had often accompanied Kim to major public events, but had not been seen since January last year.

South Korea's National Intelligence Service believes Ri and Kim have three children, but little is publicly known about the trio.

The intelligence service has also told lawmakers that Ri appears to refrain from outside activities, because of the global health crisis.