Kaley Cuoco Nixed From Grey's Anatomy Guest Role

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Last week, it was reported that the beautiful Kaley Cuoco of The Big Bang Theory was taking on a role as a guest star on the Grey's Anatomy Season 5 finale May 14.

However, just as soon as Cuoco's guest role was announced, she suddenly rescinded the chance to appear on the medical drama. Why the strange, abrupt bailing?

EW reports that the actress' rep claims a "publicity commitment" forced the star to back out of a top-secret appearance on Grey's Anatomy. But multiple sources say it was her Big Bang employer, CBS, that nixed the deal - clandestinely or otherwise.

CBS couldn't be reached for comment, but an insider explains, "They didn't want one of their biggest stars appearing on one of ABC's biggest shows." Makes sense.

As a result, Grey's Anatomy has instead tapped former OC starlet Shannon Lucio to fill Cuoco's shoes. Still unknown is who the character will be exactly.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.

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Grey's Anatomy Quotes

Arizona: Oh my God! I mean, I understand why you're into her. She's hot. Wait, she likes you?
Nathan: What? I mean, I'm going to try not to be offended at that.
Arizona: No, no, no. It's just that Derek was--Derek was epic for her. They were the great love story. I mean, that girl's heart beat for Derek Shepherd. It just...it never occurred to me that she would ever be with anyone else. He was perfect. He was everything. That man turned her world. It...I spooked you. Don't be spooked.

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)