In a bombshell announcement on Wednesday's episode of NBC's "Celebrity Circus," former "Brady Bunch" and "My Fair Brady" star Christopher Knight announced that he would be leaving the show due to a broken arm.

He announced that he had fallen in rehearsal the day before and did more damage to his already-injured arm. "This has been an incredible journey," Christopher said on Wednesday night's show, "and I really wish that I could continue the journey with you, but the doctors shut me down."

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ET was behind the scenes as the six remaining celebs were rehearsing for this week's "Celebrity Circus"' death-defying stunts. The upcoming acts include Christopher Knight high above the crowd on the Bungee, Stacey Dash attempts the Spanish Web, Antonio Sabato Jr. climbs the Chinese Poles, Janet Evans flies on the Swinging Cradle/Trapeze, Rachel Hunter balances on the High Wire and Jason "Wee Man" Acuna is suspended from the Flying Straps.

"Celebrity Circus" airs tonight at 10 p.m. on NBC.

The "Celebrity Circus" comes to town tonight on NBC when ANTONIO SABATO JR., BLU CANTRELL, CHRISTOPHER KNIGHT, JANET EVANS, JASON "WEE MAN" ACUNA, RACHEL HUNTER and STACEY DASH attempt the same death-defying stunts that take place in a real-life circus.

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