Jonas, 26, enjoyed Sunday afternoon with the blonde model skiing the slopes in Mammoth Lakes, CA, E! News reported.
The couple was photographed making out and flirting heavily.
"They arrived Saturday and left Tuesday morning. They stayed in the same Airbnb house cabin," a source told E! News. "They ate lunch together at the resort. It seemed a little new, but they were very comfortable."
Added an insider, "At one point she pulled down his ski mask and gave him a kiss. They were also hugging and kissing a lot and seen holding hands."
Jonas and Hadid, a 20-year-old supermodel and the daughter of The Real Housewives of Beverly Hills star Yolanda Foster, amicably split late last year. Jonas was reportedly a "bit upset," however, when Hadid began dating One Direction member Zayn Malik, but he's clearly moved on in recent days.
"[Joe] still has feelings for Gigi that won't just disappear overnight," a source told the website in early December.
"They did love each other and he still has a love for Gigi. He is not looking to rush into another relationship though just yet. He is focusing on his music and new projects that are in the works. He has some great friends and family around so, like anything, he knows his feelings for Gigi will pass with time."
Meanwhile, Hadid and Malik, 22, haven't been shy when it comes to PDA and gushing about one another on social media. The pair was reportedly spotted apartment hunting earlier this week in NYC but are not quite ready to move in together.