The Indian actress and the American pop star are believed to have been dating since May and, according to American celebrity site People, they became engaged last week in London as Chopra celebrated her 36th birthday.
Jonas, 25, is said to have closed down a Tiffany & Co jewellery store in New York to buy the former Miss World winner a ring, according to Evening Times.
A source told People: “They are so happy.”
Another source close to Jonas was quoted as saying the former Jonas Brothers star is “very, very happy”.
“His friends and family have never seen him like this, and they’re all really excited for him. He’s definitely very serious about her.”
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