The two reportedly began "seeing a lot of each other" when Jonas filmed a guest appearance as a child star-turned-investor on NBC's Smash, an informant told Page Six.
Jonas and Hilty have apparently also been seen around New York City quite often in recent weeks, including at a dinner date in Chelsea in March.
A separate source close to the couple has denied that Jonas and Hilty are romantically involved, saying: "They are just friends."
Hilty and Jonas's representatives have declined to comment on these reports.
Jonas, who is currently starring in Broadway's How To Succeed In Business Without Really Trying, most recently dated Australian singer Delta Goodrem for close to a year prior to their split in February.
He will return to Smash for the upcoming first season finale.
Smash airs Mondays at 10/9c on NBC.
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