Star 7 is George Harrison. I put off trying to identify his car earlier, as he owned so many. Now it's much easier. Car 10 is his 1969 Ferrari 365 GTC.
Which leaves Star 6 and Car 11, and I am currently stumped. As Wendax said, the car is a Ferrari 365 GT4 BB Berlinetta Boxer, 1973-1976, but I haven't been able to identify Star 6. Unless the picture is grossly misleading (and that's always a possibility with Otto!), he's a musician, and is sporting a very 1960s haircut.
I'll keep trying, but if anyone can identify him, there's a point up for grabs.