This week was out with the old and in with the new, as stars and fans alike said goodbye to the 2010s by ringing in the new decade. 2019 came to a close with Mariah Carey continuing to celebrate the landmark success of "All I Want for Christmas Is You," which earned the Queen of Christmas her record 19th No. 1 Billboard Hot 100 hit and led to another major chart moment for the icon as we turned the page to 2020.