Chevy Chase Shares Exciting Family Update

WESTWOOD, CA - JULY 27: (L-R) Emily Evelyn Chase, Caley Leigh Chase, actor Chevy Chase and his wife Jayni Chase arrive at the Premiere Of Warner Bros. 'Vacation' at Regency Village Theatre on July 27, 2015 in Westwood, California. (Photo by Barry King/Getty Images)

Chevy Chase's family is expanding, and the comedian couldn't be more excited!

The SNL alum proudly took to Instagram on Saturday, March 16, to share the news that his youngest daughter, Emily, 35, is expecting her first child with her partner, Alex Baglieri.

Chevy shared a sweet family photo to mark the occasion, which found him and Baglieri standing on either side of Emily, who smiled widely as they each placed a hand on her bump. Emily wrapped her own hands around each man's arm as they posed for the pic.

"I can't wait to be a Grandad!" the 80-year-old wrote excitedly, tagging the parents-to-be and sending them his heartfelt congratulations.

Emily shared another silly snap on her Instagram Story the next day in which she and her dad tapped their bellies together, with Chevy looking serious and his daughter bursting into laughter. "Touching pregnant bellies 😂," she jokingly captioned the photo.

So far, there's no word on when she's due or what she's having.

Chevy shares Emily with his third wife, Jayni. The couple also share daughters, Cydney Chase, 41, and Caley Chase, 39.

Chevy is also widely reported to have a son, Bryan Perkins, from a previous relationship, which Emily shut down as she shared a variety of headlines about her pregnancy on her Instagram Stories.

"Beyond hilarious that we have a mysterious, fake half brother who is routinely reported as being part of the family," she wrote over a screenshot from People before questioning, "Who IS he? Where did this amazing rumor start? Why isn't his last name Chase?"

"❤️ u imaginary Bryan," she added.

Next: Chevy Chase, 80, Falls Off Stage During 'National Lampoon' Event