The ceremony took place Tuesday in front of the Mirage Hotel, home of the duo's act from 1990 until Oct. 3, 2003, when Horn was attacked.
Horn was listed in critical condition for several weeks after the attack, and was said to have suffered a stroke and partial paralysis. He was walking a bit slowly Tuesday, and his speech, at times, was sluggish.
The German-born performers were given police escorts to the Walk of Stars ceremony, waving to fans through a sun roof. Dozens of fans cheered when Horn approached a podium.
"Good afternoon, everybody, my name is Roy," Horn said to applause.
Fischbacher thanked fans for sticking by the pair. "And now I realize what love is and life is all about," he said.
After the ceremony, Horn told AP Television that the event was "a deeply emotional experience." When asked about the state of his rehabilitation, Horn said: "We'll go horseback riding and I'm driving my new car, yes. I've got a new sports car. So, it's my birthday gift."
Horn also marked his 62nd birthday Tuesday.