Keith Urban figured out a way to make wife Nicole Kidman's birthday extra special. During his concert Saturday at Soldier Field in Chicago, Keith performed "Who Wouldn't Wanna Be Me" for his wife, who turned 41 on Friday. Then he asked the crowd of 50-thousand to join him in singing "Happy Birthday" to Nicole and brought her onstage. After the song, Nicole blew the audience a kiss and returned backstage. The Academy Award-winning actress is pregnant with the couple's first child, and is due any day.

During Nicole's birthday on Friday, the celebrity couple were spotted at the Schermerhorn Symphony Center enjoying a Nashville Symphony concert -- an all-Russian program conducted by Kelly Corcoran. The couple also attended the second weekend of the First Tennessee Summer Festival.