United Kingdom, Sept. 2 -- Domhnall Gleeson was mortified to learn he'd have to dance in Taylor Swift's Opalite video.

The Paper actor was among a string of guests from The Graham Norton Show who the pop superstar invited to be in the promo with her - along with Cillian Murphy, Greta Lee, Jodie Turner-Smith, Lewis Capaldi and the host himself - and while he was thrilled to be a part of it, he doesn't think he'd have pulled off his storyline without Taylor's "trust".

He told The Guardian newspaper: "They told me the day before there was going to be a dance. I was like, are you f****** joking? I'm terrible at it!"

Domhnall admitted he spent the whole night practising in front of the mirror but Taylor ultimately got him through.

He added...