Ashley Graham and her director husband, Justin Ervin, have welcomed their first child, a son, on Jan. 18.

"At 6:00pm on Saturday our lives changed for the better," she wrote via her Instagram story. "Thank you for all your love and support during this incredible time." She has yet to reveal her son's name.

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Graham, 32, announced she was pregnant back in August via her social media pages:

"Nine years ago today, I married the love of my life. It has been the best journey with my favorite person in the world!" Graham wrote on Instagram at the time. "Today, we are feeling so blessed, grateful and excited to celebrate with our GROWING FAMILY! Happy anniversary, @mrjustinervin Life is about to get even better."

The plus-sized model told Jimmy Fallon back in December that her pregnancy felt "like a sci-fi film every day."

"There's like a little alien taking over my stomach, and I swear he's on a treadmill. And one day he's just gonna be running out of me!" she joked. "At least, that's what I'm hoping for."

Congratulations go out to Ashley Graham and her beautiful, growing family.