Jon Hamm doesn't feel the need to get married.

The 'Mad Men' star has been with partner Jennifer Westfeldt for 15 years but doesn't think making their union official will make any difference.

He said: ''The flip answer is, if it ain't broke, don't fix it... The better version of that is that any relationship is a day-in-day-out process.

''Having a piece of paper serves to remind you of your commitment but we do a pretty good job of reminding each other.''

Despite his image as a sex symbol, Jon doesn't consider himself handsome because he still thinks he is ''goofy''.

He added to Britain's Elle magazine: ''I just don't consider myself handsome. I look at the people in the world that I consider truly handsome, like George Clooney, Brad Pitt, Ryan Reynolds, Bradley Cooper - those guys.

''When I look in the mirror I see my goofy-ass self from when I was a kid. I guess we just all have that deep version of ourselves and it never really goes away.''