She shot the second half of the hour-long show for U.K. network ITV on Thursday, performing new tracks including 1+1, Party and Run The World (Girls).
But she had to call time on the set after struggling to maintain her powerful voice towards the end of the gig, blaming her lack of rest, and apologized to fans in the audience for making Countdown her last song of the night.
Sources tell WENN she then enlisted the help of her devotees to sing the chorus, before exiting the stage to rousing applause and cheers.
Earlier in the day, Beyonce treated her waiting fans to free pizza to show her appreciation for their support. Attendees began lining up outside the studio doors hours before showtime to ensure they got prime seats for the intimate show.
A Night With Beyonce is due to air in the U.K. later this year (11).