Phelps, who will be known as as Mike Jonas, is now the oldest Jonas. Insiders say that could help Kevin Jonas, who at 20 was previously the oldest, regain more boyish appeal with the groups' younger fans, while also keeping Phelps in the spotlight.

"Let's be honest, nobody really gives a sh*t about swimming except for two weeks every four years," said Joe Simpson, who recently become Phelps' manager. "Now that he's a Jonas Brother, Americans will actually know who Mike is and pay attention to him for the next three years and 50 weeks."

Mike Jonas is expected to become the roguish prankster of the group, with a humorous but slightly more mature sensibility that Walt Disney Company executives hope could broaden the brothers' appeal from girls aged 8-12 to girls aged 8-15. It is still being determined what instrument he will pretend to play and who will do voice overs when he sings.

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