Musicians Nick Jonas, Joe Jonas and Kevin Jonas of the music group The Jonas Brothers. Photo by AP.
The 21-year-old Jonas is one-third of the popular Jonas Brothers, along with Joe and Nick Jonas.
A spokeswoman for the Jonas Brothers confirmed the engagement.
In a statement, Kevin's parents, Kevin Sr. and Denise Jonas, said they were "filled with joy."
The young couple have not yet set a date. Their engagement was first reported by People magazine.
People quoted Kevin Jonas as describing his girlfriend's reaction as "yes, yes, yes like 500 times super fast in a row."
