Prunella later shows up at the wedding, revealing she is not a robot, she just had a battery pack because she put lights in her dress as a surprise for Nevel.

Was Nevels wife a robot?

At the wedding, Carly tells everyone that Prunella is a robot and Nevel reveals that he and Prunella weren't actually getting married. It was merely a ruse to get Carly to marry Nevel. Carly cancels the wedding, but at this moment, Prunella professes her love for Nevel.

Who married Carly in iCarly?

Prunella Pitz

On the day of the wedding, she professes her feelings for him by turning on her LED belt, which says "I really do love Nevel." The two end up getting married.