January Jones has a ''blast'' working with her boyfriend.

The 37-year-old actress is dating Will Forte, 44, and the pair are having fun starring together in new comedy show 'The Last Man on Earth'.

She said: ''It's a blast! It's such a funny group of people, and we just have a lot of fun. And it's very refreshing to go to work and laugh all day, and everyone's sweet.''

However, the 'Mad Men' star - who has a three-year-old son, Xander, from a past relationship with an unknown man - refused to discuss her relationship with the actor.

She said: ''I don't talk about my personal life.''

As well as enjoying filming 'The Last Man on Earth',January had a wonderful time shooting 'Good Kill', a movie about drone warfare which she stars in alongside Ethan Hawke and Zoe Kravitz.

She told People magazine: ''I'm a huge, huge fan of Ethan; I know Zoë, so it was a very small cast, a very intimate group, and just the subject matter - it was an important story to tell.''

January recently admitted marriage is no longer very important to her.

She said: ''I think when I was younger I was keen on having marriage, kids and all that. But as I got into my late twenties and early thirties, all my ideals shifted and having a document to prove love wasn't really important to me. It's the relationships that were important, and I still think that way.''