April 21, 2011 15:12:00 GMT
Young stars including Justin Bieber and Blake Lively have joined Britain's Prince William and Kate Middleton on Time Magazine's list of the 100 most influential people in the world.
The newly-released list sees the teenage pop singer, Justin Bieber and the "Gossip Girl" star, Blake Lively added among stalwarts including media mogul Oprah Winfrey and U.S. President Barack Obama.
Bieber's mentor Usher put together a tribute piece about the pop star for the magazine, writing, "From the minute I met Justin, I knew this kid possessed a certain confidence that only a star could have. He was born a star... The reality of who he is and what he's accomplished far exceeds anybody's expectations of him."
Moviemaker Baz Luhrmann praised Blake Lively as channelling the "vitality of youth - that indefinable, natural, unprocessed glamour".
Prince William and and his bride-to-be Kate Middleton also make the list ahead of their upcoming royal wedding next week, while other stars included in the top 100 are British Oscar-winner Colin Firth, singer Bruno Mars, actor Mark Wahlberg and "Glee"'s Chris Colfer.