(Cover) - EN Showbiz - Jon Hamm says the key to a successful relationship is listening.

The American star has been dating Jennifer Westfeldt for many years and they recently teamed up for the movie Friends with Kids. Jennifer wrote and directed the picture and also appears in it, alongside Jon and Megan Fox.

Jon insists working so closely with his partner was no problem. He loves spending time with Jennifer and says being with her so much has helped him understand how to make a romance work.

Believe it or not, after 15 years of a relationship Ive learned to actually listen when she starts talking, he explained.

Friends with Kids is about a couple who begin to consider what they want out of life when they notice how starting a family changes all their friends.

Despite being together for so long Jon and Jennifer have no plans to marry at the moment. He has previously said he already feels fully committed to the relationship, and sees a wedding as something which happens once a couple are preparing for kids. (C) Cover Media