Joe Biden has been sworn in as the 46th US president at the US Capitol in Washington.
Vice-President Kamala Harris has taken her oath too – becoming the first woman to hold that position.
Biden and Harris are visiting Arlington National Cemetery to lay a wreath on the Tomb of the Unknown Soldier, accompanied by former presidents Barack Obama, George W. Bush and Bill Clinton.
In his first speech, Biden said “this is democracy’s day” and that the US “has much to do in this winter of peril, much to repair”.
The new president said the country must confront the rise of white supremacy, and reject manufactured facts.
Lady Gaga sang the US national anthem, and singers Jennifer Lopez and Garth Brooks performed.
Amanda Gorman, 22, who was the first National Youth Poet Laureate, became the youngest poet to perform at a presidential inauguration.