Last weekend we were celebrating Twiggy, this weekend it's Olivia Newton-John's turn. From Grease to Glee — who can forget the "Physical" duet with Sue Sylvester — we've rounded up 10 iconic beauty shoots of the Aussie actress and singer. Who knew that she wore balayage before us all, that her flicks could've taken Farrah's back in the '70s or that she threw it all in to go Russian-style in the '80s, which is totally reminding me of Sophie's ANTM shoot, no?!