Keith Lemon spat in Ashley Roberts' face.

The Keith Lemon Sketch Show

The Keith Lemon Sketch Show

The 'Celebrity Juice' host has revealed the former Pussycat Dolls singer maintained her professionalism during filming for a documentary to celebrate the 30th anniversary of the film 'Back to the Future' despite him ejecting his saliva on to her face.

Speaking about signing the blonde beauty up for the second series of 'The Keith Lemon Sketch Show', Keith exclusively told BANG Showbiz: "Ashley's fantastic. She ticks many boxes and she's very good. When we made the 'Back to the Future' documentary she let me spit in her face four times and she was so cool."

The 42-year-old comedian - whose real name is Leigh Francis - revealed Ashley will "sensitively" impersonate Caitlyn Jenner in the ITV2 show as well as taking on the role of a famous cartoon character.

He explained: "She's going to play ... Who's the sexy one out of 'Scooby Doo'? Is it Velma? [Daphne?] Yeah, she's going to play her as well."

Keith will also be addressing Zayn Malik's decision to quite One Direction earlier this year in the next series of the hit show.

He added: "We're going to do One Direction having an exciting life and Zayn at home playing on his Nintendo doing nothing because all he wanted was a normal life, didn't he?"

'The Keith Lemon Sketch Show' DVD is out now.