Billie Eilish Gushes Over Performing With Childhood Idol Paramore's Hayley Williams

Billie Eilish gushes over her childhood hero, Hayley Williams, in a tribute on Instagram, following their onstage performance together.The 21-year-old made a surprise appearance at Paramore's concert in Los Angeles on Wednesday, performing a duet of the band's 2009 track, 'All I Wanted.'