Olivia Munn needed ''lube'' to squeeze into her 'X-Men: Apocalypse' costume.

The 35-year-old beauty - who's been cast as psychic ninja Psylocke in the eagerly-awaited new sci-fi movie - has revealed she needed some assistance in order to fit into her on-screen outfit.

Explaining how she squeezed her curves into the figure-hugging costume, Olivia said: ''They lube me down, and I step into this latex - we did a whole latex fitting...

''They lubricate the costume, and they lubricate me... Two women lubed me up.''

Olivia also revealed her initial excitement at meeting her on-screen co-stars Michael Fassbender and James McAvoy quickly evaporated after suffering a wardrobe malfunction.

She told chat show host Conan O'Brien: ''The first day I put on the latex suit, I was out there and I was really excited to be with these guys. I met Michael and James everybody, and I was just so excited.

''I was like, 'OK, I wanna do like a really good job,' and I just popped the crotch. The latex just broke.''

'X-Men: Apocalypse' - which also stars Oscar-winning actress Jennifer Lawrence - is set for release in May 2016.