11/29/2007 AT 05:00 PM EST
Around the Kidman
household, Mother's Day is really more of a, well ... Nicole Day.
Speaking on Britain's morning show GMTV
, the Oscar winner, 40, revealed that when she is addressed by her two children with former husband Tom Cruise – Isabella, 15, and Connor, 12 – "They don't call me Mommy."
"What do they call you then?" she was asked.
With a frown, she replied: "Mom or, sometimes, Nicole. I'm like, hey!"