Disney tween queen gets back with Nick Jonas!

No sooner than Miley Cyrus Tweet-ed "Finis" for male model BF Justin Gaston, 20, with this profundity: "My heart is in two ... and its all because of you" than the heartbroken beau boo-hooed back with "Haven't been this miserable in a looong time."

The nubile songstress jetted down to Savannah, Georgia to start lensing new flick where she was soon joined by on-off-on oldie but goodie BF Nick Jonas.

Locals caught them jetsking together, spooning the waves-appearing as happy as can be.

Ain't luv grand? Always swell to see "Uncle Walt" keeping his kids together.