Sang Tan, Associated Press
Michael Phelps

Butterfly, freestyle, relay — monologue? Michael Phelps is trading the pool for the "Saturday Night Live" stage.

The record-breaking swimmer, who took home eight gold medals at the Beijing Olympics, will host the 34th season premiere of NBC's long-running late-night sketch-comedy series on Sept. 13. Joining the 23-year-old athlete as musical guest will be rapper Lil Wayne.

It will be the debut "SNL" appearances for both.

The network will air seven new "SNL" episodes before November's presidential election.