Katharine McPhee Is So Excited To Be An Auntie!

Katharine McPhee is going to be an aunt!

The 32-year-old Scorpion actress took to her Instagram to reveal that her sister Adriana is pregnant with her first child.

PHOTOS: Check out the latest pics of Katharine McPhee

“I’m going to be an Auntie!,” Katherine captioned with the post on Monday (November 14). “So excited Seester! 🙏🏼😇#auntie #babyboy #sisterispregnant #family #sisters”

Katharine hit the red carpet at the Zimmer Children’s Museum Discovery Award Dinner alongside Terrence Jenkins, Scooter Braun and his pregnant wife Yael Cohen last night (November 15) at the Skirball Cultural Center in Los Angeles.

That same day, Katharine was spotted out doing some shopping in Beverly Hills.

10+ pictures inside of Katharine McPhee at the Zimmer Children’s Museum Discovery Award Dinner…