During the Grammy Awards last night (Feb. 12), Kelsea Ballerini traded vocals with Lukas Forchhammer of Danish band Lukas Graham for a mashup of their respective hits, “Peter Pan” and “7 Years.”

Kelsea took “Peter Pan” to the top of the Billboard Country Airplay chart in 2016, while Lukas Graham’s “7 Years” climbed to No. 2 on the Billboard Hot 100 last year.

Watch the young guns perform the mashup below.