The very first smd-5050 were fitted on the Audi S6 in 2006.
Back then, it was in the form of a smd-5050 straight strip on the air intakes on the bumpers.

Later in 2006, the Audi R8 sported the distinctive trademark curved LED headlights.

So to put it simply, the S6 pioneered 12 volt led lights the use of LEDs, but the R8 popularized the curvy LED design.

If you would want an Audi with flexible led strip genuine LEDs, you can look for:

Audi A1 (2010 - )
Audi A3 (2008 - )
Audi A4 (2008 - )
Audi A5 (2007 - )
Audi A6 (2008 - )
Audi A7 (2010 - )
Audi A8 (2010 - )
Audi Q3 (2011 - )
Audi Q5 (2009 - )
Audi Q7 (2009 - )
Audi TT (2011 - )