Katharine McPhee, 37, and David Foster, 71, step out for the FIRST TIME with son Rennie

Katharine McPhee and husband David Foster, 71, were spotted out for the first time with their newborn son Rennie on Thursday as they enjoyed brunch in Beverly Hills.

The family dined outdoors at the swanky Maybourne Hotel with a select group of friends in celebration of McPhee’s 37th birthday.

Katharine, who welcomed her first child with David in late February, looked every bit the doting mother as she tenderly cradled Rennie in her arms at their designated dining table.

Clearly smitten, Katharine pressed her son’s head to her cheek before planting a few kisses on him.

The tiny newborn looked sweet in a bright white onesie and flailed around in his mother’s arms as she continued to coddle him. 

Katharine and David were first seen arriving to the upscale establishment with Rennie stowed away safely in a padded baby carrier, which Katharine handled with ease.

The Waitress actress looked spring-ready in a colorful floral mini dress with a plunging neckline that allowed her to show off her smooth décolletage.

Due to the breezy weather, Katharine layered up her ensemble with an ivory cable knit cardigan that hung just past her dress.

She had a myriad of gold chains hung around her neck and a pair of gold hoops in her ears.

McPhee’s brunette hair was parted down the middle and styled into a chic low ponytail and sported a natural, flushed makeup look.