VIDEO: Gavin Newsom sworn in as California's 40th governor

SACRAMENTO, Calif. (KGO) -- Gavin Newsom has been officially sworn in as California's 40th governor. The Democrat served on San Francisco's Board of Supervisors and as the city's mayor for seven years.

VIDEO: Gavin Newsom's 2-year-old son steals show during inaugural address

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This may have been the most important moment in Gavin Newsom's political career -- but his adorable 2-year-old son Dutch was the one who stole the show.

"It will be the honor of a lifetime to take the oath of office as California Governor," said Governor-elect Newsom in a press release. "But it seems appropriate to use this moment to unite as a state - stronger and more resilient than ever - to do whatever we can to ensure all of our fellow Californians, especially those impacted by tragic wildfire, have the opportunity to build a brighter future and pursue their dreams."

VIDEO: Looking back at Gavin Newsom's rise from renegade San Francisco mayor to governor of California

On Sunday, Newsom hosted "California Rises: A Concert to Help the Victims of California Wildfire" at Sacramento's state-of-the-art Golden 1 Center. The relief concert helped fund long-term recovery and rebuilding for Californians and communities distressed and displaced by devastating and unprecedented wildfires in 2017 and 2018.

VIDEO: Governor Newsom's full inauguration speech
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Gavin Newsom is officially California's 40th governor after a swearing-in ceremony in Sacramento.

All proceeds went to the California Fire Foundation, a nonprofit organization, which provides emotional and financial assistance to families of fallen firefighters, firefighters, and the communities they protect. These funds will be dedicated to long-term recovery and rebuilding for individuals and areas impacted by wildfires over the last two years.

Earlier on Sunday, Governor-elect Newsom - who ran on a campaign centered on expanding opportunities for all children in California - and incoming First Partner Jennifer Siebel Newsom, parents of four young children, hosted a unique children's event open to the public at the California State Railroad Museum in Sacramento.

Take a look at more stories and videos about Gavin Newsom.

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