Kirstie Maldonado is making holiday history while spreading Christmas cheer…

The half-Mexican American/part-Spanish singer and her fellow Pentatonix group members, who earned their first-ever Grammy nomination on Friday, have become the first act to top both of Billboard’s seasonal charts simultaneously.

Pentatonix’s “Mary, Did You Know?” tops the Billboard Holiday 100 chart this week. The Christmas song actually earned top debut honors on the Billboard Hot 100 chart.

Meanwhile, the group – the winners of NBC’s The Sing-Off – command the Billboard Top Holiday Albums chart for a sixth week with That’s Christmas to Me (227,000 sold, up 129 percent, according to Nielsen Music). It’s led the chart since its November 8 debut.

Additionally, That’s Christmas to Me is the first album by a group to notch as many as six straight weeks at No. 1 on Top Holiday Albums since Hanson‘s Snowed In likewise blanketed the list for six weeks in 1997-98.

“Mary” marks Pentatonix’s second Holiday 100 No. 1: “Little Drummer Boy” topped the Dec. 21, 2013, chart.