What: The 15th annual EIF's Women's Cancer Research Fund event 'An Unforgettable Evening'.
Where: The Beverly Hilton hotel in LA.
Bonus info: After all the bikini Instagrams and Coachella partying (including those suspicious white powder photos), we're kind of disconcerted to see Rihanna in the presence of proper grownups. But not quite as disconcerted as we are to see Steven Speilberg grinding to Riri's choons. Take a look at the gallery below to see all the photos.