The Hills alum Frankie Delgado is expecting his first child with his wife Jennifer Acosta, Us Weekly exclusively confirms -- find out the sex of the baby Credit: FameFlynet, Inc.

Daddy duty! The Hills alum Frankie Delgado is expecting his first child with his wife Jennifer Acosta, Us Weekly can exclusively confirm. The couple will soon be the proud parents of a baby girl.

"He's so excited for the baby," an insider tells Us of Delgado, 32. The reality star and Acosta's little bundle of joy is set to arrive this summer.

The pair has kept mum on the pregnancy, but on Feb. 7 Acosta's baby bump officially debuted while celebrating Lauren Conrad's birthday party. (The Paper Crown fashion designer turned 28 on Feb. 1.)

"Such a fun HOEDOWN bday party with my amazing friend @Laurenconrad and wifey @jennifermdelgado #yeeehaaa," Delgado wrote via Instagram. Alongside the caption, the dad-to-be shared a sweet snapshot of the trio. His former Hills costar sticked to the theme with a cute plaid top and cowgirl hat, as Acosta covered up her pregnant belly with an inflatable plastic horse.

Delgado and Acosta got engaged on Valentine's Day in Cabo San Lucas, Mexico in 2012. Last July, they tied the knot at Rancho Las Lomas near Dana Point, Calif., with Conrad, Brody Jenner, and Reggie Bush in attendance.