Elizabeth Gillies and Milo Manheim have officially started ... the actress had a fun reunion with her Victorious co-stars Avan Jogia and Daniella Monet. Life is about to change in a big way ...

Maybe it's time for Elizabeth "Liz" Gillies' iconic Jade West character ... know they were coming," she says of her former costars. "Avan texted me that day and said, 'Hi, love.

In February, Deadline reported a spinoff of Nickelodeon's Victorious starring Daniella Monet, who's set to reprise her role ...