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 ...

Liz Gillies: Me too. I think it's cool that you ... for Victorious fans because there was a reunion in the room with Avan Jogia and Daniella Monet there. Gillies: I didn't even know they were ...

Liz Gillies needed Ariana Grande's "blessing ... including Daniella Monet and Avan Jogia, but she had no idea they were coming to see her and they ended up "giggling like children" afterwards.

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

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.