"Saturday Night Live" (search) is going to wait until the last minute to replace Tina Fey (search) as the anchor of its signature "Weekend Update."

Fey gave birth to her first child, a daughter, Alice, last Saturday, and will be out on maternity leave for most of the season.

The series begins airing new shows Oct. 1.

With Fey out — and "SNL" trouper Maya Rudolph (search) also out on maternity leave — the cast was beefed up yesterday with two unknowns.

Bill Hader, of L.A's Second City comedy troupe, and Andy Samberg, a New York comedy writer and member of the Lonely Island comedy group, will join in time for the season premiere.

An "SNL" spokesman said yesterday that no decision has been made on who'll co-anchor "Update" with Amy Poehler.

When she returns to "SNL," Fey will juggle the show with shooting her NBC sitcom pilot, which is described as a "semi-autobiographical" look at Fey's time on "SNL."

Meanwhile, it was also reported in the trades that "SNL"ers Kenan Thompson and Finesse Mitchell, who'd been featured players, are now full-time cast members.