Douglas plays gay entertainer Liberace in the new film, which stars Damon as his lover and the 42-year-old actress has been giving her spouse encouragement on set, reported Contactmusic.
"Catherine was on set coaching Michael during his love scenes going 'Come on honey, use some tongue and get into it. Is that how you'd kiss me?'" she said.
Jones previously said that she had to order her husband away from her clothes and jewellery while he tried to get into character of the film.