Fox has canceled Ryan Seacrest's summer reality series Knock Knock Live due to low ratings.

Variety reported the show -- which features celebrities such as Justin Bieber arriving on regular people's doorsteps to present them with prizes -- was taken off the air after two episodes.

Replacing the program in the Tuesday 9 p.m. timeslot will be an hour of The Last Man on Earth this week, then repeats of Brooklyn Nine-Nine and The Last Man on Earth after that.

Seacrest will return to the network in January to host the final season of American Idol.