Carrie Underwood reveals son Isaiah took his first steps just before she kicked-off her Storyteller Tour

Carrie Underwood's son, Isaiah Michael, just hit a major milestone -- he took his first steps!

The 32-year-old country crooner revealed the good news to her audience in Jacksonville, Florida, on Saturday. Even cooler? It was the very first night of her Storyteller Tour.

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"She was just leading to her next song and talking about what a big year it has been and how she thought that touring and making albums would be the best thing in her life, but she was wrong, because she had a baby," a concertgoer told ET.

The "Little Toy Guns" singer couldn't help but gush about 11-month-old Isaiah's big day. "He means the world to me. He took his first steps today in Jacksonville," Underwood can be heard saying in an Instagram video as the crowd cheers in excitement.

She then dedicated a song to her son and her husband, Mike Fisher, sitting on the piano and looking at slideshows of the two main men in her life as she belted out the tune.

See photos of Underwood and Fisher:

Fans took to Twitter to share their excitement over the big news.

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Plenty of other folks shared photos from the kick-off show, with many gushing over Underwood's amazing performance.

The singer's hockey player hubby also posted a photo from the audience, where he was cheering on his wife's performance.

"Amazing first show of the storyteller tour! #proudhubby," Fisher captioned photo, which Underwood later regrammed

Following the show, the American Idol alum took tweeted to the fans that attended the show.

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"Jacksonville!!!!! What an amazing crowd! I had SO much fun on stage tonight! THANK YOU! #TheStorytellerTour," she wrote.

This isn't the first time Underwood has been candid first-time parenthood. To see the hilarious thing she declared as one of her "mom problems," watch the video below.