The singer looked horrified when she let the cat out of the bag while talking to NBC Los Angeles on the red carpet.

The 'Love on the Brain' singer is expecting her third child with A$AP Rocky, an event co-chair.Why send out a regular old pregnancy announcement when you can spread the word at the most glamorous event of the year?

The Met Gala red carpet had plenty of surprises, from Rihanna's pregnancy to a standout moment from Diana Ross. See all the highlights from the night.