"Rockstar" (stylized as "rockstar") is a song by American rapper Post Malone. It was released on September 15, 2017, by Republic Records as the first single from his project Beerbongs & Bentleys. The track features a guest verse from fellow American rapper 21 Savage, and was produced by Tank God and Louis Bell (who co-produced his hit single "Congratulations"). It was written by Post Malone, 21 Savage, Louis Bell and Olufunmibi Awoshiley.
The track reached number one on the US Billboard Hot 100, and reached the top spot in several other countries, including Australia, Canada, Ireland, New Zealand, and the United Kingdom. It became both Post Malone and 21 Savage's first number-one single in all the countries mentioned.