LOS ANGELES Pregnant pop superstar Beyonce heads into the Grammy awards on Sunday aiming to clinch her first album of the year win, while riding high on a wave of goodwill that greeted her surprise announcement that she was expecting twins. The biggest night in the music industry is expected to mark her first public appearance since the 35-year-old singer announced her pregnancy on Feb. 1 with a message and an elaborate photo shoot proudly displaying her baby bump that broke social media records. In a live show as much about spectacle as trophies, Beyonce’s appearance on the Grammy stage has not been officially confirmed. But celebrity website TMZ said the “Formation” singer, known for her high energy dance performances, had been seen rehearsing in Los Angeles for the show last week. Other performers at the three hour show include Katy Perry, Lady Gaga, The Weeknd, Bruno Mars, Adele, Demi Lovato, best new artist nominee Chance the Rapper, A Tribe Called Quest, Carrie Underwood, Alicia Keys and album of the year Americana music nominee, Sturgill Simpson. Beyonce has a leading nine Grammy nods for “Lemonade,” her powerful visual album about race, feminism, betrayal and empowerment. The R&B singer will compete head on with Britain’s Adele, the only other artist to be nominated for all three top awards – album, song and record of the year – for her comeback release “25”. But the 2017 Grammys will also be as much about absent friends as those taking part in Sunday’s show….more detail