Billie Eilish joins Paramore on stage to sing 'All I Wanted'.

Billie Eilish joined Paramore at their Los Angeles show this week at the Kia Forum to perform 'All I Wanted' with the band. 

Over on Instagram, Eilish shared about the experience: "UGHHDKSLDJSKFJKSKFUDJSKKFKDKDK dream come truEEEEEE @paramore waaahhhhhhhhhhhhhhhhhh😭😭 i love you so much hayley holy shit. wish i could tell tiny me :’))))"

Watch clips from the performance below...