She smoldered on the red carpet in a leggy, velvet peplum gown that she paired with sky-high heels.
'It was my pleasure to honor my friend Jon Platt for all the good work he does for the City of Hope,' she wrote on Instagram yesterday.
'City of Hope makes creating medical miracles its priority in the fight against cancer and life-threatening diseases.'
The Lemonade songstress was joined by her husband, Jay-Z, at the fundraiser. She also reunited with friend and fellow Destiny's Child vet, Kelly Rowland, before taking to the stage for a special performance. Beyonce closed the gala with a medley of songs including XO, Perfect, Ave Maria, and Halo.