Lopez was critiquing contestant Jena Irene’s performance when Connick Jr. began taunting her about her hair flip.
The pop singer had advised Irene to flip her hair around and proceeded to give a demonstration.
“Do that again!” Connick Jr. exclaimed. “I feel another hair flip coming on!”
“No!” Lopez protested but the crooner continued to nag her.
“Hair flip! Hair flip!” he chanted.
J. Lo was so flustered she cursed, but then immediately realized she was on live television and grabbed her mouth in shock.
Fortunately, the Fox censors bleeped her in time.
“That’s Jenny From The Block!” said Connick Jr.
Watch the clip: