Post Malone caps off the biggest year of his career with a surprise single “Wow.”

Over the two-and-a-half-minute track, Posty raps about fame and fortune. “And your grandmama probably know me,” he sings over the laid-back beat. “It’s a moment, when I show up, got ’em saying, ‘Wow.'”

Earlier in the month, Posty promised fans that he would release a new song before the end of 2018.

Malone recently scored his first four Grammy nominations including Album of the Year for beerbongs & bentleys and Record of the Year for “rockstar.” He will headline two shows on Dec. 29 and Dec. 31 at Brooklyn’s Barclays Center before heading overseas in February for a European tour.