OMG (Usher song)
"OMG" reached number one in charts in Australia, Ireland, New Zealand, the United Kingdom and the United States. This gave Usher his ninth number one song in the US. He then became the first artist to have number one songs in three decades (1990s, 2000s, and 2010s). The song sold 3.8 million copies in the US. It sold 6.9 million copies worldwide.