Rita Wilson has made her first appearance since she and husband Tom Hanks were both struck down with Covid-19.

The 63-year-old singer and actress sang the American national anthem during NASCAR's iRacing Pro Invitational Series Race in a pre-recorded video.

Last month, Rita and her Hanks were diagnosed with Covid-19 after coming down with "body aches, chills and slight fevers".

He announced on Instagram at the time: "Hello, folks. Rita and I are down here in Australia. We felt a bit tired, like we had colds, and some body aches.

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"Rita had some chills that came and went. Slight fevers too. To play things right, as is needed in the world right now, we were tested for the Coronavirus, and were found to be positive.

"Well, now. What to do next? The Medical Officials have protocols that must be followed.

"We Hanks' will be tested, observed, and isolated for as long as public health and safety requires. Not much more to it than a one-day-at-a-time approach, no? We'll keep the world posted and updated. Take care of yourselves! Hanx!"

Covid19.govt.nz: The Government's official Covid-19 advisory website

Tom is taking things "one-day-at-a-time" after his Covid-19 diagnosis.

Alongside a photograph of himself and Rita, Tom wrote: "Hello folks. @ritawilson and I want to thank everyone here Down Under who are taking such good care of us. We have Covid-19 and are in isolation so we do not spread it to anyone else.

"There are those for whom it could lead to a very serious illness. We are taking it one-day-at-a-time. There are things we can all do to get through this by following the advice of experts and taking care of ourselves and each other, no? Remember, despite all the current events, there is no crying in baseball. Hanx (sic)"