Fergie and Josh Duhamel's 7-month-old son Axl Jack is living up to his rock and roll namesake.

Meaning? "He's a screamer," mom told E! News exclusively Thursday in Washington, D.C., as Avon launched a new initiative speaking out to end gender-based violence against women. "There's always this high-pitched scream going throughout the house."

The 38-year-old singer explained that while Axl likes to be vocal, "it's not him complaining or crying. He just gets excited and he wants to scream!" The Avon Foundation Global Ambassador and her little man even have "little scream-offs" against each other.

PHOTO: Aw! Fergie and Axl Jack strike a pose

"Mommy scream-offs," she said with a smile. "Those are exciting!"

Hear more from Fergie about these "fun" little scream-offs in the clip above. Plus, did you know Axl is already playing the piano? Well, kinda... Watch what Mama Duhamel has to say about that, too!

For much more from Fergie's interview, tune in to E! News Friday at 7:00 and 11:30 p.m.

—Reporting by Vanessa McDonald

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