“‘Did we just become best friends!?’ Such a good time filming with this dude. @robbieamell is the man. Much excitement to come once we return from hiatus!” Grant, 24, joked on Instagram with one of the pics.
Robbie and Grant were seen shooting an action scene late into the night.
“Finally in bed. Long night shoot on The Flash. Goodnight everyone,” Robbie wrote.
15+ pics inside of Robbie Amell and Grant Gustin…