Olivia Newton-John didn't like 'Grease 2'

And it seems Olivia has no regrets about passing on the project.

Asked what she thought of 'Grease 2', she admitted: "Not a lot.

"They did ask us, I think they approached John and I to do it, and then it didn't happen, and I didn't think it was gonna happen, and then they made it with other people."

However, when it came to the recent TV special 'Grease Live!' -

which saw Julianne Hough in her role of Sandy and Aaron Tveit as Danny - Olivia had more positive things to say.

Speaking on 'Watch What Happens Live', she said: "I liked it. Yeah, it was fun."

The singer-and-actress also shared her memories of making the original movie and how much "fun" she and her co-stars had.

She said: "It was like going back to a school that I never went to.

"We were all in our late 20s and 30s, but we felt like we were teenagers, so I think the whole thing was a lot of fun from beginning to end. We had a great energy."

Elsewhere on the show, Olivia admitted one of her "few regrets" was turning down the chance to tour with Frank Sinatra because she had just had a baby.

She said: "That would be one of my only, few regrets. I would have loved to have sung with him, that would've been amazing."

And she confessed to being terrified at the thought of working with Gene Kelly on 'Xanadu', but the experience turned out to be "amazing".

She said: "It was terrifying because I had never tap danced before, and the fact that I was going to be dancing with such an amazing, legendary dancer was kind of terrifying.

"But he was lovely. It was very special - I feel very grateful that I got to know him a little bit."