The third season of High School Musical: The Musical:

The Series premiered this Wednesday (27) on Disney+ and the cast got together to celebrate at a preview event. 

Sofia Wylie, Matt Cornett, Olivia Rodrigo and Joshua Bassett were there.

Yes, there was Olivia and Joshua's reunion, and it was the most talked

about moment of the night on social media. In addition to starring in the series together, the two also had a 

romantic relationship and apparently that's how the inspiration for the 

SOUR songs - which generated a wave of hate on Joshua at the time of release - came about.