Jaleel 'Urkel' White Explodes at 'Dancing with the Stars' Partner Kym Johnson

| by

Trust me, if you mess up Urkel's rhythm while he's in the middle of the Samba or Viennese Waltz, there will be hell to pay my friends. Hell to pay. His Dancing with the Stars partner Kym Johnson found that out on Friday.

From Us Weekly:

Dancing with the Stars celeb Jaleel White had a seriously bad rehearsal session with pro partner Kym Johnson on Friday -- leading to a "heated" confrontation in which Mark Ballas and show producers eventually intervened, an insider tells Us Weekly exclusively. The Family Matters alum, 35, "flipped out," the insider says, after he accidentally stepped on Johnson's foot. When Johnson, 35, exclaimed "ouch" over his blunder, the insider says, White "got in her face," and chastised her for "acting like a baby . . . He was shouting at her, calling her an 'idiot.'"

Pro dancer Mark Ballas then tried to confront White himself. "The producers stepped in and broke it up before it got physical, but they were really going at it -- right up in each other's faces!" the source explains.