Apollo showed off his musical skills on his mom's Snapchat.
Photo: Snapchat
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The singer is also a mom to sons Zuma and Kingston Rossdale (right), whom she shares with ex-husband Gavin Rossdale.
Photo: Rich Polk/Getty Images for Feeding America
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Gwen's new tour kicks off July 12 in Mansfield, Massachusetts.
Photo: Michael Tran/FilmMagic
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Blake is already a natural around Gwen's children.
Photo: Kevin Winter/Getty Images for iHeartMedia