Nicole Richie thinks Christina Aguilera is a "great wife".

The "Simple Life" star befriended the "Car Wash" singer when they gave birth to their first children, Harlow and Max, last January.

Nicole said: "Christina and I haven't known each other long but we met through mutual friends. Because we had our babies at the same time - they were born one day apart - we've got to know each other.

"She's a great wife, great mom and great singer. She does it all. And I'm sure Max gets better lullabies than Harlow!"

The 27-year-old socialite also spoke about her on/off friendship with hotel heiress Paris Hilton.

She said: "We went through a phase where we weren't speaking, but I think you can safely say that for anyone who has been friends for 25 years.

"I don't really get into fights with people, and if I ever had a falling out it has ultimately been resolved. It's part of growing up."

(China Daily/Agencies March 9, 2009)