Mother Monster—or Goddess of Love, as she now likes to be called—watched the "Perfume" singer take the stage at Las Vegas' Planet Hollywood as part of her two-year Piece of Me residency. "Tonight's show is gonna be a good one, I can feel it. Who's coming?" Spears asked her Twitter followers.
Gaga, 27, said she'd be rocking "long blond hair" and "androgynous wear" for the two-hour concert.
"Come hang before the show starts," Spears, 32, told her pop peer. "Can't wait to see you."