Lady Gaga shocked the world when she started her Super Bowl LI halftime performance on the roof of NRG Stadium in Houston.
The whole performance was done in total Gaga fashion — think impressive dance moves, a sparkly Versace outfit, a piano ballad and a mic drop.
Naturally, some very famous Twitter and Instagram users reacted immediately to the epic performance. Even Hillary Clinton had something to say about it. See all the best reactions below: