‘DWTS’ Feud! Stars ‘Irritated’ Over Christie Brinkley’s Daughter’s Addition To Cast

The Dancing with the Stars contestants are already feuding – and they haven’t even hit the dance floor yet! RadarOnline.com can exclusively reveal Christie Brinkley’s daughter Sailor’s surprise addition to the cast has set off younger singers Ally Brooke and Lauren Alaina.

“Ally and Lauren seem irritated that another young celebrity has come into the mix,” a source told RadarOnline.com. “They are annoyed there is another young girl to go up against.”

The insider added that Ally, 26, and Lauren, 24, “counted Christie out because of her age."

Christie’s daughter is replacing the former supermodel after she broke her arm during rehearsal on Friday, September 13.

“Showbiz is all about getting a break, and Sailor and I both got one on Dancing With the Stars this season,” Christie, 65, said in a statement. “Sailor joined the cast when I got mine… ouch somebody stop me, it hurts to laugh!”

Sailor, 21, said during an appearance on Good Morning America, “I’m doing this mostly for my mom! I just want to make her happy and make her proud. She loved doing this, she loves dancing and she loves performing and getting hurt was her worst nightmare.”

As RadarOnline.com previously reported, executives were "freaking out," over Christie's injury, as she was "the big name this season.”

In addition to Ally and Lauren, Sailor is joining Hannah Brown, Karamo Brown, Kate Flannery, Ray Lewis, Kel Mitchell, Lamar Odom, Sean Spicer, James Van Der Beek and Mary Wilson.