5. Carly Rae Jepsen
Carly Rae Jepsen is a Canadian-born singer who became famous in her country, but the thing that made her an international superstar is a YouTube video that she posted. She filmed herself performing her big hit “Call me Maybe”, which Justin Bieber noticed and shared. Bieber tweeted about her hit song, and the next thing that happened is that this song made a big wow in the U.S. Pop charts. This song became the biggest earworm in 2012, placing Carly Rae Jepsen at #5 on our list of the 11 celebrities who got famous from YouTube.
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