Zac Efron has praised late Friends actor Matthew Perry for motivating him to reach the next stage of his career after starring together on 17 Again, during a speech at the Hollywood Walk of Fame.The High School Musical star, 36, was honoured with his own star on the iconic Hollywood road, which he described as "so surreal" and "just insane." During his speech, he also opened up about his time working with his 17 Again co-star Matthew, who passed away in October, aged just 54. He said: "I really also want to mention someone that is not here today, and that’s Matthew Perry, who was so kind and generous with me when we worked on 17 Again." He continued: "Collaborating with him…it was so much fun and it really did propel me and motivate me in so many ways.