Billie Eilish's brother Finneas O'Connell and Claudia Sulewski attend premiere of I Love My Dad

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Billie Eilish's brother Finneas O'Connell and his girlfriend Claudia Sulewski looked very much in love at the premiere for her film I Love My Dad in Los Angeles.The 25-year-old producer extraordinaire wore a black sweater over a matching t-shirt, while the YouTube star, 26, stunned in a black blazer and a pair of matching skinny slacks.Sulewski left the blazer wide open revealing her black wire strap underneath it.

Her dark hair was parted in the middle and tied back into a tight ponytail. Loving:Claudia Sulewski andBillie Eilish's brother Finneas looked very much in love at the premiere for her film I Love My Dad in Los AngelesSulewski's nails were painted pitch black, and she stood on a pair of matching high heels.She clung tightly to O'Connell's arm on the carpet.

He added a pair of green slacks and shiny black dress shoes. Amber-tinted glasses covered his eyes and a thin gold chain hung from his neck.His feathery brown hair stuck out at a number of odd angles, adding an extra inch to his height.

Dazzling:The YouTube star, 26, stunned in a black blazer and a pair of matching skinny slacks Holding on:She clung tightly to O'Connell's arm on the carpet.