The model was seen supporting his band at their rock show in Los Angeles on Friday night, and documented the concert on her Instagram story.
Josie Canseco tagged the band's IG handle while watching from the audience.
This was a big deal for Brody and his band because it was their first live debut show.
"The Hills" star even wrote about his excitement over the monumental moment on his social media.
"The time has finally come," he wrote. "We have been working on this project for quite some time and put in countless hours to create a unique and massively stimulating show."
Josie, who is 22 years old, was a proud bystander who appeared to be front and center during the rock show.
She even shared a video showing Brody and his band on the stage and added a heart eyed emoji.
The two reportedly hung out with his MTV co-stars Frankie Delgado and Brandon Lee until the wee hours of the morning.
Brody and Josie were even spotted outside the venue kissing.
It was later found out they never filed the required paperwork to make their marriage official in the U.S.
But there's no hard feelings between Brody and Kaitlynn. He even jumped to her defense on Friday and cleared up all the negativity surrounding their split.