Cutie Chelsea Staub has sung praise to her “J.O.N.A.S!” co-star Nick Jonas. Speaking to Girls2Watch, the depicter of Stella Malone on the TV series has called the 17-year-old singer “definitely the brains” behind his famous musical trio, Jonas Brothers.  “He’s the little brother, but he’s in charge of it all and he writes pretty much all of the music,” Chelsea reveals. “He definitely has ‘it’, whatever ‘it’ is, Nick’s got it. He plays drums and keyboard and guitar and writes and does all of it well. So he’s definitely the musical one in that family.” Beside talking about Nick, Chelsea also comments on his older brother, Joe Jonas. “He’s just the entertainer. He’s a goofball on and off set. He’s constantly pulling pranks and getting us into trouble and he’s great when he’s on stage. He really sells it,” the 21-year-old beauty says.  Chelsea, moreover, shares her opinion about a proper job for the oldest Jonas, Kevin Jonas, stating “He should be a salesman.” She goes on detailing, “He’s really easy to talk to, always dresses to the nines, and is definitely the manager of the band. He keeps everybody in check.”