Camila Cabello
Her debut solo album, Camila, was released on January 12, 2018.  It entered at the top of the Billboard 200 album chart in the US with over 119,000 combined streams and copies sold.  With this, she became only the third artist in history to have their first number-one album and first number-one single in the same week.  Only Beyoncé and Britney Spears have done this before in 2003 and 1999, respectively.