Joe Jonas Surprises Demi Lovato Onstage! See The Pics

Travis Barker also hits the Demi World Tour to drum with her.

Demi Lovato was in good company on Saturday night when her "Camp Rock" costar Joe Jonas surprised her onstage during the Los Angeles stop of her Demi World Tour.

It has been four years since Lovato and Jonas sang together, and the "Really Don't Care" singer documented the occasion well, giving us all FOMO for not being at the Staples Center. Together, the former couple sang "This Is Me."

Not only was Joe there, but Travis Barker from Blink-182 joined her too, dueling Demi on drums. "Played drums with the iconic @travisbarker at Staples Center. A night I'll never forget. #demiworldtour."

Joe isn't the only Jonas who has his hand in Demi's tour -- little brother Nick Jonas serves as the creative and musical director for the trek.

"He had visions for this tour," Demi told MTV News earlier this year. "And he threw out some ideas and they were really good, and we just thought, ‘Why don’t you just do the whole tour, please?’ so it’s turned out amazing and like 90 percent is his work."