Beyoncé will appear with Kamala Harris in Houston on Friday, according to media reports.

The star turn will confirm that, following Harris’s endorsement by Taylor Swift last month, the Democratic vice-president and US presidential candidate has the support of the two most popular musicians in the world – a potentially invaluable asset for galvanising young voters.

Harris is rallying in Texas, a Republican stronghold, to highlight abortion rights and support Democratic Senate candidate Colin Allred, who trails Republican Ted Cruz in opinion polls.

Beyoncé, 43, will appear in her home city along with her mother, Tina Knowles, and 91-year-old country music giant Willie Nelson, according to sources cited by the Washington Post newspaper.

The event presents an opportunity for Beyoncé to give a live performance of Freedom, a song from her 2016 album Lemonade, which the vice-president has been using as walk-on music at rallies while making freedom a central theme of her campaign.

Beyoncé, who has hundreds of millions of followers on social media, sang a cover of Etta James’s At Last at one of President Barack Obama’s inaugural balls in 2009, before singing the national anthem at Obama’s second inauguration ceremony in 2013.

She performed Formation at a rally for Democrat Hillary Clinton three days before the presidential election in 2016 and told the crowd: “I want my daughter to grow up seeing a woman leading the country. That’s why I’m with her.”

Her backing of Harris is therefore no surprise and fed fevered speculation – and inaccurate reporting – that she would make a dramatic entrance at this summer’s Democratic national convention in Philadelphia.

Beyoncé becomes the latest celebrity to bring star power to the Harris campaign. On Thursday, the Democrat is holding a rally in Atlanta, Georgia, with musician Bruce Springsteen, film director Spike Lee, actor Samuel L Jackson and actor and filmmaker Tyler Perry as well as Obama.

Other musicians supporting the Democrat include Eminem, Cher, Billie Eilish, Barbra Streisand, Carole King, John Legend and Stevie Wonder. Trump has the backing of Jason Aldean, Lee Greenwood, Kanye West and Kid Rock, while the Republican national convention was shown a video featuring rapper Forgiato Blow and reality TV star Amber Rose.