Cast member Scarlett Johansson arrives for the premiere of the film "We Bought a Zoo" in New York, December 12, 2011.[Photo/Agencies]

Scarlett Johansson doesn't regret her marriage.

The 'We Bought a Zoo' actress' divorce from Ryan Reynolds was finalised in July but she insists it would be a "waste of time" to lament their two-year-union as she has had such a "charmed" life until her relationship woes.

She told US TV show 'Extra': "I don't believe in having any regrets. It's a waste of time to regret anything. I own all of my decisions, and I've led a very charmed life up until this point."

Despite having no regrets, the 27-year-old beauty admits she has had a "challenging" 12 months.

She told 'Access Hollywood': "I've had ups and downs. Certainly, this past year has had a lot of unexpected things in many beautiful ways, many challenging ways."

When asked if she think she'll ever walk down the aisle again, Scarlett joked she thinks she would have to go undergo therapy to find out.

She said: "That's a deep question that I think probably requires a cheque for $250, and a couch - lying down."

Despite their marriage failing, Scarlett has admitted her union with Ryan was the "best thing" she ever did.

She previously said: "It was the best thing I ever did. I'm a big believer in instinct. Getting married was the right thing to do because it was natural. It grew out of romance and love and a desire to have a future with somebody, and I was very fortunate that I married somebody who turned out to be the person I thought he would be."