The Jonas Brothers member will reprise his role as ex-child star Lyle West in the NBC show's May 14 closer, says The Hollywood Reporter.
The 19-year-old made his first Smash appearance last month, when his character became an investor in the Marilyn Monroe musical on which the show centres.
Jonas teased after his first cameo that viewers "definitely could see Lyle pop up" in Smash again.
"If they do have me back it really provides an opportunity for him to get deeper into it and kind of dig in and get more involved," he said at the time.
Smash airs Mondays at 10/9c on NBC.
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