Jonas Dropping Pounds On Broadway

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January 26, 2012 | 2:25pm EST

Lean Nick Jonas is beefing up his diet after already dropping five pounds (2.3 kilograms) during his Broadway stint in How To Succeed In Business Without Really Trying.
The singer made his debut on Tuesday night, following in the dancing footsteps of Glee’s Darren Criss and Harry Potter star Daniel Radcliffe as social climber J. Pierrepont Finch.

The Burnin’ Up hitmaker admits he’s having a blast on the stage, but he’s concerned the physically-demanding role will have an unintended affect on his waistline.

During an appearance on breakfast show Good Morning America on Thursday, he said, “It’s amazing, and I did do a bit of working out and prep before I started rehearsals… I’ve lost probably four or five pounds. Pounds that I didn’t have to lose really! So I was a bit like, ‘Uh-oh.'”

Jonas will headline the show until 1 July and the pop star fears the New York City summer heat will only make matters worse.

He added, “In that three-piece suit at all times, and sweating a bit, I can only imagine what the summer’s going to be like.”