She announced the extra night on her Mrs. Carter Show World Tour following phenomenal demand.
Tickets for both shows on February 20 and 21 went on sale at 10am yesterday and have sold out.
Beyonce's released self-titled new album has already topped the American charts despite only being released on Friday.
More than 80,000 copies were sold within three hours of release.
The Mrs Carter Show World Tour will run for five weeks and include performances in Spain, Ireland, Holland, Belgium and Germany.
In the UK, she is due to play in Birmingham and Manchester, following her double appearance in Glasgow.
The 32-year-old pop sensation is married to rapper Jay-Z, aka Shawn Carter.