Stefanie Heinzmann (*7 March 1989) is a punk and soul singer from Eyholz, Switzerland.Heinzmann gained local fame in Eyholz and the surrounding area fronting the band Bigfisch.Heinzmann gained popularity in Germany, Austria and Switzerland when she competed in the reality-TV singing competition SSDSDSSWEMUGABRTLAD ("Stefan sucht den Superstar, der singen soll, was er möchte, und gerne auch bei RTL auftreten darf") in 2007.

She was popular for her soulful voice, and for being the youngest competitor in the top 20.She won the competition on January 10, 2008. Her debut single "My Man Is A Mean Man" was released the following day on January 11th; the single also featured songs by the other 3 finalists of the show.

Heinzmann won a recording contract with Universal Music and her debut album was released on Mar 7, 2008.