As she marks her 41st birthday on Friday, Nicole Kidman is enjoying every minute of her life in Nashville and is eagerly awaiting the birth of her first child with hubby Keith Urban, a close pal tells PEOPLE.

"She's never been happier or healthier," the friend says. "She is absolutely radiant and enjoying nesting and homemaking with Keith at their new home in Nashville."

The special day began early, with the birthday girl and Urban making one of their regular stops at the local Starbucks.

The couple also mark their second wedding anniversary on June 25. And, by all accounts, the expectant actress has been enjoying a leisurely last few weeks before the birth of their child next month. "They are so relaxed," the friend adds.

Kidman and Urban, 40, made a brief trip to New York last week, where they took in an evening performance of the Tony-winning August: Osage County at the Music Box Theatre and eschewed any special, VIP treatment for the three-and-a-half-hour show.

"Nicole is always very gracious, and she doesn't run from people," a source says. "She looked wonderful, and they seemed very happy." The pair did, however, dodge paparazzi waiting outside.

Closer to home in Tennessee, the couple lives a seemingly normal life: they're regulars at their local Starbucks, take in movies on the weekends (they just saw You Don't Mess with the Zohan), tend to their organic vegetable garden and work out together.

"She's very nurturing," says Australia cinematographer Mandy Walker. Kidman stars opposite Hugh Jackman in the Baz Luhrmann epic due for release in November. "She's really lovely."