<Li> Donald O'Connor as Cosmo Brown , Don 's lifelong pal , and vaudeville partner , who becomes the head of Monumental Pictures ' music department . </Li>
<Li> Donald O'Connor as Cosmo Brown , Don 's lifelong pal , and vaudeville partner , who becomes the head of Monumental Pictures ' music department . </Li>
who played cosmo in singin in the rain
who played cosmo in singin in the rain
Donald O'Connor
Donald O'Connor