Charlize Theron (search) says marriage is not her thing — but she isn't ruling out the possibility of becoming a mother someday.

In an interview on "Access Hollywood" that aired Tuesday, the 30-year-old actress said she was "happy for people who want to get married."

But, she said, "it's not my thing."

Theron's mother, Gerda, was married this past weekend.

"I'm extremely happy in my relationship," said Theron, who has dated Stuart Townsend (search) for several years. "I would love to have kids."

Townsend and Theron, who won an Oscar for her role in 2003's "Monster," appeared in the films "Trapped" and "Head in the Clouds."

Theron's new film, "North Country," is due in theaters Oct. 21.