Lady Gaga "slayed" when she performed on X Factor, according to fans.
The music superstar graced the stage during the results show and many viewers said her set was "extraordinary" and "beautiful".
However, some viewers think the show's own Saara Aalto could give Gaga a run for her money.
Some canny viewers have got the right idea though - the powerhouse singers need to combine their talents.
Sounds like a good idea!