When you're walking the star-studded and packed red carpet at the 2014 Met Gala in NYC, it's difficult to always be in the right place at the right time. At Monday night's celebration, celebrities often found themselves in the background of another star's shot. One of the best photos was taken while Rihanna was attempting a sexy pose, only for her pals Reese Witherspoon and Stella McCartney to burst out in laughter behind her. Gisele Bündchen, Mary-Kate and Ashley Olsen, and Kristen Stewart were also victims of the background breach. Keep reading to see the best interrupted moments, and then check out the most stunning Met Gala staircase shots!