An adjustable peach aligner cup assembly 20 is provided for use in an automatic peach aligning and pitting mechanism. An adjustable alignment ring has first and second movable segments 51,52. Segments 51,52 are moved away from each other to align large peaches and are moved toward each other to align small peaches. An actuator 61,62 causes the segments 51,52 to move. An optional sensor 80 is provided which allows the segments 51,52 on a specific aligner cup assembly 20 to be adjusted on a peach-to-peach basis to align a specific peach.