Actress Katie Holmes has congratulated her husband's ex-wife Nicole Kidman on her pregnancy, People reports.

"I'm so happy for her. It's wonderful," the 29-year-old actress, who is now married to Tom Cruise, said.

Kidman announced earlier this week that she is expecting a baby with her singer husband Keith Urban.

Kidman and Cruise have two children from their marriage, 15-year-old Isabella and 12-year-old Conor.