The singer announced that she was pregnant at the music event last month by rubbing her visibly enlarged belly at the end of a performance of her new single 'Love On Top'.
However, Media Takeout has claimed that the 30-year-old star is in fact only eight weeks pregnant and not showing at all.
The site explained: "Our insider claims that Beyoncé IS IN FACT pregnant. But that she is NOT in her second trimester - she's only a little more than eight WEEKS pregnant. Tells the insider, 'She wanted the announcement to be dramatic, so she made sure she had a baby bump.'"
The star saw a surge in sales of her recent album 4 following the announcement.
The 'Best Thing I Never Had' performer has also insisted that she intends to stay busy throughout her pregnancy.
> Beyoncé pregnancy announcement sparks new Twitter record
Watch the music video for Beyoncé's '1+1' below: