Stefanie Fabienne Heinzmann (born 10 March 1989) is a Swiss soul and pop singer. She gained public interest in early 2008 when she won SSDSDSSWEMUGABRTLAD, a talent contest hosted in Stefan Raab's late-night-show TV total on the German ProSieben network.

Following her win, Heinzmann subsequently released her debut single "My Man Is a Mean Man," which debuted straight on top of the Swiss Singles Chart and became a top ten hit in Austria and Germany during the following months. Her pop soul-influenced album Masterplan was released in March 2008 and made it to the top ten in Austria and Germany, also reaching number one in Switzerland, where it was certified platinum by the IFPI for more than 30,000 copies sold. In September 2009, Heinzmann's second album Roots to Grow was released.