Elizabeth Gillies and Milo Manheim have officially ... 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 for 16-year ...

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.