You may remember, the rapper was set to sing four years ago but backed out due to the sudden death of his mother, Donda West.
And he took a moment to remember her, before launching a surprise...
"In 2007, I was supposed to perform this song...then my mom passed away," Kanye told the crowd. "She was my superhero—now she's my superangel."
Awww. With that, West burst into a rendition of "Stronger," before asking a surprise friend to join him: Jay-Z. The crowd went wild as the rappers performed a duet from their Watch the Throne album.
Later, Maroon 5 crooner Adam Levine had a special moment of his own. While performing "Moves Like Jagger," he escorted supermodel girlfriend Anne Vyalitsyna to the end of the runway, hand in hand.
Miranda Kerr's hubby Orlando Bloom didn't walk the carpet, but she said earlier that he'd be watching her from inside the venue.
Celebs on the carpet were eager to get to their seats and see all the stunners in the flesh up close, but La La Anthony did give us a quick update on her BFF Kim Kardashian.
"She's holding up, thank you," she told us as she rushed into the Lexington Armory.