NBC has confirmed that Fey will host the May 7 episode, which will feature a Ellie Goulding as musical guest. Helms will make his "SNL" hosting debut May 14 with musical guest Paul Simon, and Timberlake will host the season finale May 21 with musical guest Lady Gaga.
Fey has been seen Off-Broadway with fellow "SNL" cast member Rachel Dratch in their two-women show, "Dratch & Fey," at the Upright Citizens Brigade Theater. She is best known for her work as creator and star of NBC's "30 Rock," and in 2010 was the recipient of the Mark Twain Prize for American Humor.
The May 7 episode marks Fey's third round as host for "SNL."
"SNL" airs at 11:30 PM ET on NBC.