The duo who has been friends for several years recently decided to take to take their relationship to the next level, reported OK! magazine.
"They are inseparable right now. Things have gotten serious pretty quickly." said an insider.
The singer has also been supporting the model as she looks after her ill mother, who is suffering from Lyme disease.
Jonas, 25, and 20-year-old Hadid were first linked last September while the blonde beauty was on a break from her on-and-off boyfriend Cody Simpson, 18, but she split from the Australian singer for good in May.
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