The slip occurred after the audition of gorgeous Israeli singer Shira Gavrielov, who wowed the judges with her rendition of Amy Winehouse's Valerie, and got the golden ticket to Hollywood.
"I just want to say that I love you," Minaj told the 23-year-old prospect, while the handsome country crooner said, "I love her vibrato."
Afterwards, as the judges cooed over her star qualities, Urban spilled his jumbo-sized Coca-Cola cup on Minaj and the fancy desk, though the Super Bass singer took it in stride, laughing it off.
"Oh my God, I'm so sorry … we'll have to edit right here," Urban joked.
Watch the video on RadarOnline.com
We'll see if the drinks stay upright when American Idol's 12th season continues Thursday on Fox at 8/7c.