Beyonce at Coachella: Michelle Williams said Beyonce was 'brilliantly involved in every decision'

The Gospel singer said Beyonce was "involved in every decision" at Coachella.

Williams said on "Good Morning America" Monday that the three pulled it off thanks to "a lot of rehearsal."

"The last rehearsal, we were acting like little girls again," the singer recalled. "You just get up there and have a lot of fun."

Beyonce's performance, which is being hailed by many as the greatest Coachella performance of all time, explored themes of black pride and higher education.

And thanks to her marching band, it was hard to ignore that Beyonce wanted her Coachella performance to feel like a halftime show at any historically black college and university.

Williams, 37, said Beyonce "was just brilliantly involved in every decision."

"I saw her a part of everything. She'd be in rehearsal in one room, then she'd run over [to look at costumes] in another room," she continued, adding that all the while Beyonce was trying to maintain her vegan diet by snacking on almonds and oranges.

"Kelly wants to throw my bachelorette party," she gushed, adding her mother called dibs on her bridal shower.

The "Say Yes" singer said she "was so shocked" at the engagement.

"I was crying so loud that people were turning around going back to their rooms," Williams quipped on "GMA."

And her father had one warning for his future son-in-law.

"My dad told him, 'If you hurt my daughter, sir, this is what's going to happen,'" she said laughing, pounding her first.