Commissioner Adam Silver chose Booker to take Davis’ spot a day after Booker was snubbed by the league’s head coaches for a reserve spot in the March 7 game in Atlanta.
Davis, voted in as a reserve, is sidelined by a strained right calf.
Booker received his second straight All-Star selection, both as an injury replacement. He’s averaging 24.7 points, 4.3 assists, 3.8 rebounds and shooting a career-high 50.1% from the field.
Booker and fellow All-Star Chris Paul have helped Phoenix to a 20-10 record, fourth-best in the NBA. The Suns last had two All-Stars in 2009-10 with Steve Nash and Amare Stoudemire.
The Associated Press contributed to this report.