They looked cool, calm and very attractively collected as they arrived together to the LA eatery on Thursday evening for a date night to rival any other.
On a photo of Priyanka having a wow of a time at In-N-Out (find us someone who wouldn't have a wow of a time there and we'd have found you a liar) he said: 'That smile'.
Sitting on the garden patio, the rumored couple enjoyed guacamole, ceviche verde, chicken tacos and the Japanese wagyu beef. "They made it clear they were a couple", a source told E!
A source told People: 'They were very affectionate with each other and seemed to not care who saw. They posed together, she in her wonderful Ralph Lauren trench coat gown and he in a patterned jacket, and the Jonas Brother even revealed his fondness by posting a photo of her to Instagram with the simple caption, "Priyanka".
Priyanka and Nick sparked off dating rumours when the two had made an appearance together for the first time at the Met Gala past year.
"They were both very happy and smiley and seemed to really be enjoying each other's company".
At the time, the former Bollywood star appeared on Jimmy Kimmel and was quick to shoot down any dating rumours when the TV host asked about their relationship.
What do you think about these celebs together?