Nicole Kidman: "I've had severe morning sickness"

Nicole Kidman has revealed she's suffering from "severe morning sickness."

"I've had severe morning sickness," the pregnant actress, 40, told Access Hollywood on Monday -- when she and her country music star husband Keith Urban hit the red carpet at the CMT Awards in Nashville.

The 'Stepford Wives' star, who was sporting a figure-hugging red dress that showed off her expanding baby bump, also admitted to wondering if the most difficult part is yet to come.

"[I'm] good actually, really good. Waiting for the third trimester," she said. "Everyone says that is hard work."

Kidman -- who has two adopted children -- Connor, 12, and Isabella, 14 -- with ex-husband Tom Cruise -- is set to give birth to her first child with Urban later this year.