In the Seinfeld episode "The Voice" Jerry inadvertently says Sarah Rose Peterson (Claire) is fat. Is she?

Is she really, fat? Or did he just mess up when he was talking to her (I know the line in the script was supposed to be that way) but..was his line, right?
In the Seinfeld episode "The Voice" Jerry inadvertently says Sarah Rose Peterson (Claire) is fat. Is she?
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