The music icons also shared a special moment on stage and after the show on Sunday in London.
Here's a look at some of the A-listers who brought their A-game to the red carpet.
The singer shared their encounter on her social media.
Harry Styles and James Corden stopped Los Angeles traffic for a special performance.
The 31-year-old singer stunned in a black-and-green swimsuit.
The 53-year-old actress doesn't hold back when asked about her 'Fight Club' and 'Ocean's 8' co-stars.
The 'Late Night' host recalled what it was like day drinking with the 31-year-old singer.
Don't worry, these lovely ladies didn't steal too much attention away from the brides!
RiRi wrote "BRB" and gave one intense answer to a question about her highly anticipated album.
From Oprah Winfrey to Natalie Portman and Miley Cyrus, ET's taking a look back at Zac Posen's most memorable red carpet moments.
The singer shut down Instagram with her slow-motion clip.
ET was at the launch of Rihanna's lavish book on Friday night in New York City.
From New York City to Hollywood and everywhere in-between, see how the A-listers are living it up right now.
ET caught up with the superstar at the launch of her visual autobiography, Rihanna, out Oct. 24.
