The iconic Irving Berlin composition previously reached a No. 2 AC high, thanks to a virtual collaboration version by Michael Bublé and Bing Crosby in 2012. Crosby's classic original was released in 1942 and is, according to Guinness World Records, the best-selling song of all-time.
Trainor and MacFarlane's "White Christmas" is additionally the 25th holiday No. 1 on the AC chart since 2000, around the time that a majority of stations in the format began playing seasonal songs 24/7 between Thanksgiving and Christmas each year.
Here's an updated recap of all the holiday songs that have hung atop AC's highest bough since 2000:
Title, Artist, Chart Date Reached No. 1, Weeks at No. 1
"White Christmas," Meghan Trainor feat. Seth MacFarlane, Dec. 12, 2020, one (to date)
"Like It's Christmas," Jonas Brothers, Dec. 14, 2019, three
"Cozy Little Christmas," Katy Perry, Dec. 29, 2018, one
"Have Yourself a Merry Little Christmas," John Legend feat. Esperanza Spalding, Dec. 8, 2018, three
"Santa's Coming for Us," Sia, Dec. 23, 2017, three
"Baby, It's Cold Outside," Brett Eldredge feat. Meghan Trainor, Jan. 7, 2017, one
"Have Yourself a Merry Little Christmas," Josh Groban, Dec. 24, 2016, one
"This Christmas," Train, Dec. 17, 2016, two
"This Christmas," Seal, Jan. 2, 2016, one
"Baby It's Cold Outside," Idina Menzel duet with Michael Bublé, Dec. 20, 2014, three
"Underneath the Tree," Kelly Clarkson, Dec. 2, 2013, four
"Let It Snow, Let It Snow, Let It Snow," Rod Stewart, Dec. 8, 2012, five
"All I Want for Christmas Is You," Michael Bublé, Dec. 10, 2011, five
"Oh Santa!," Mariah Carey, Dec. 18, 2010, four
"A Baby Changes Everything," Faith Hill, Dec. 20, 2008, three
"I'll Be Home for Christmas," Josh Groban, Dec. 22, 2007, three
"Frosty the Snowman," Kimberley Locke, Dec. 15, 2007, one
"It Came Upon a Midnight Clear," Daryl Hall John Oates, Dec. 30, 2006, two
"Jingle Bells," Kimberley Locke, Dec. 23, 2006, one
"Up on the Housetop," Kimberley Locke, Dec. 17, 2005, four
"Believe," Josh Groban, Dec. 11, 2004, five
"Sending You a Little Christmas," Jim Brickman with Kristy Starling, Jan. 3, 2004, one
"O Holy Night," Josh Groban, Dec. 28, 2002, two
"Simple Things," Jim Brickman feat. Rebecca Lynn Howard, Jan. 5, 2002, one
"The Christmas Shoes," NewSong, Jan. 6, 2001, one
All charts will update on Billboard.com tomorrow (Dec. 8).