Diana Ross, 81, offers hilarious take on Stranger Things after it gave huge streaming bump to her old song

Diana Ross made a riotously entertaining disclosure about Stranger Things after her 1980 song Upside Down was used on the show.

The sci-fi series, which is set in the 1980s, dropped its final season on Netflix last year with one episode prominently featuring Ross' beloved disco single.

Upside Down subsequently experienced a thunderous 373 percent bump in on-demand streams, according to a report in Billboard.

However when Ross, 81, performed the song recently in concert at The Wynn Las Vegas, she revealed not only that she had never seen the show, but that she was in fact not entirely certain it was a show at all.

'You know that song is a hit all over again,' she said onstage to a round of applause: 'with that movie, that television show - what is it, a movie? Stranger Things?'

Shen then cheerfully asked an audience member: 'What is that movie about?' in footage posted by TV producer John Pascarella at his Instagram handle @jpasc24.

'STRANGER THINGS may be a global hit … And may have helped Diana Ross’ UPSIDE DOWN race up the charts again … But she hilariously revealed during a recent Las Vegas show at The Wynn that she doesn’t know much about the show ….,' Pascarella captioned the video when he uploaded it Thursday. 

The Queen of Motown was playing Las Vegas as part of her international Diana in Motion tour, which will whisk her off to the UK and Japan later this year. 

After whirling through such American locales as San Antonio, Memphis, Nashville and Orlando, she will perform in the Japanese cities of Yokohama and Osaka in May and wrap up the concert run at the Brighton and Hove Pride festival in England in August. 

Ross' take on Stranger Things stood in droll contrast to that of Kate Bush, whose 1985 song Running Up That Hill (A Deal with God) was also used on the show.

As with Upside Down, Running Up That Hill enjoyed a surge of renewed popularity thanks to its appearance on the hit sci-fi series.

Bush gushed that she had been a fan of Stranger Things throughout its run, praising the show in particular for its 'touching' use of her song as a 'talisman' for the Sadie Sink character Max, according to the Hollywood Reporter. 

'I think they put it in a really special place. I thought: "What a lovely way for [Running Up That Hill] to be used, in such a positive way,"' said Bush, 67.

She noted that the song 'was written as the idea of a man and a woman swapping with each other. Just to feel what it was like, from the other side.'

Meanwhile Upside Down - a favorite of King Charles - was written for Ross by Nile Rodgers and Bernard Edwards, the founders of the disco group Chic.

'Upside down, boy, you turn me inside out and 'round and 'round,' Ross sings in the chorus of the song, which was the lead single of her smash solo album Diana.

'Instinctively, you give to me the love that I need. I cherish the moments with you,' she continues in one of the verses. 'Respectfully, I say to thee, I'm aware that you're cheating when no one makes me feel like you do.'

'Diana Ross was the first big star we ever worked with and we took it very seriously,' Rodgers said in an interview quoted by the blog Twenty First Century Music.

He and Edwards spent days interviewing Ross to get a sense of her personality, in contrast to their previous work with the girl group Sister Sledge, for whom they had recently written the now classic 1979 single We Are Family.

'This was the first time in her life somebody cared about who she was; what she was - everyone previously had treated her the way we had treated Sister Sledge - they got her in and said: "Sing this,"' Rodgers observed.

They changed tack with Ross 'because we felt we'd misrepresented Sister Sledge because we hadn't met them before they came in to sing We Are Family.'