30 Rock will have a one-hour series finale, NBC has confirmed.

It was announced yesterday that the forthcoming seventh season of the comedy series will be its last.

The sitcom, which was created by actress and comedian Tina Fey, will have an extended last episode of 60 minutes to mark the end of the series.

NBC entertainment chief Robert Greenblatt was quoted by TV Line as saying: "I know Tina, Alec Baldwin and the rest [of the cast] will deliver some of their best work. We think the world of Tina."