Watch the video here!
The Jonas Brothers' special guest appearances continued at Fenway Park in Boston over the weekend.
Jesse McCartney returned, plus actor Glen Powell made an appearance.
AND Hi FM throwback legend, JoJo, made an appearance.
JoJo and the Jonas Brothers performed JoJo's hit single 'Leave'.
Watch the video here:

JISOO is releasing new music
Ashe releases new version of 'Stop The Wedding'
Hunger Games soundtrack revealed
Justin Timberlake to star in new documentary
Mariah Carey launches her Christmas campaign