John Travolta and Olivia Newton-John have recreated scenes from Grease in a video for their new Christmas album.
But this time around their singing and dancing has been widely panned - even being labelled "creepy" and "odd".
The pair, who starred as Danny and Sandy in the 1978 musical, released This Christmas last month honouring Travolta's late son Jett.
It is the first time the stars have recorded together in more than 30 years.
The first single from the album, I Think You Might Like It, was written by John Farrar, who penned their famous pop duet You're The One That I Want.
But the Grease-inspired video for their new track has been ridiculed since its release earlier this week.
Guardian columnist Sali Hughes said on Twitter: "This has blown my mind. Oddest video ever."
US radio host Kelly Collis tweeted: "This is the most awkward Christmas Song with Olivia Newton and John Travolta."
New York Magazine's entertainment section Vulture has published a list called: "Ten Things That Creep Us Out About John Travolta and Olivia Newton-John's New 'Music Video".
But the clip does have its fans.
Emily, who tweets as cpfcrox , said: "I can't lie, I absolutely love the John Travolta & Olivia N-J album. It is fantastic. Camp, cheesy and Christmassy, all I need!"
Proceeds from the album, which also features Barbra Streisand, Tony Bennett and James Taylor as guest artists, are going to charities The Jett Travolta Foundation and the Olivia Newton-John Cancer and Wellness Centre in Melbourne.
Mashable writer Brian Anthony Hernandez said: "The pair's dance moves in the new music video aren't very reminiscent of the swagger they exuded as Danny Zuko and Sandy Olsen in Grease, but the good thing is proceeds from This Christmas benefit charities."
The Grease co-stars said they remained close friends since the 1978 hit, and were delighted to be working together again.
"My desire was to make This Christmas an intimate album, not something too ostentatious or showy," 58-year-old Travolta said in the press release for the album .
"From the moment we decided to do this, magic happened," said the US star of Pulp Fiction, Get Shorty and Hairspray.
Newton-John, 64, said she was still surprised at the success of Grease, which is about the love affairs of 1950s high school students.
"We still have little kids coming up to us who are discovering the movies. It's like three generations who love the movie, who are going to be thrilled to see Danny and Sandy, as they think of us, together again," the Australian said.
Jett Travolta died in 2009 aged 16 after suffering a seizure. His father said Christmas could be a difficult time for his family.