Kristen Bell says it was the ''best decision'' marrying Dax Shepard.

The 'Frozen' star wed the 40-year-old actor in 2013 and has admitted she would love to repeat the day over and over again.

When asked by a fan what day in her life she'd want to go back to, she wrote on Twitter: ''Moment i promised myself to @daxshepard1. best decision ive made 2date #OAchats (sic)''

The 34-year-old star also revealed the secret to their successful marriage was communication and compromising.

When questioned about how she makes her marriage to Dax work under the spotlight, she replied: ''HardWork. On communication. Listening, Caring, Compromising. #OAChats. (sic)''

Meanwhile, Kristen - who has daughters Lincoln, two, and Delta, three months with Dax - recently joked she wanted him to get a vasectomy so the pair are unable to have any more children.

She quipped: ''Maybe I'll be a stay-at-home mom. Maybe I'll have had five more kids ...

''No, I don't want to be outnumbered! I think we're stopping at two. I'm not even sharing a soda with Dax until he gets his tubes tied!''

And the star also admitted she was worried about being ''crotchety'' as a mother and wants to make things ''fun'' for her little girls.

She said: ''Before we had kids, I'd say to Dax, 'I don't want to be like those people.' I saw a few parents I didn't envy and was terrified I'd become crotchety and close-minded like them.

''And he said, 'Those people had bad personalities before they had kids.' Which is maybe the best point ever made. I was like, 'You're right! And we're fun, so let's stay fun.'''