After the event, the 25-year-old singer-actor was spotted dining with actress Madeline Brewer at Via Veneto in Santa Monica, California.
The 25-year-old Handmaid's Tale star was also at the Critics' Choice Awards and was still wearing her sequin Elizabeth Kennedy gown when she joined Jonas for dinner.
The two were also at Sunday's 75th Annual Golden Globe Awards, but posed separately on the red carpet.
Brewer -- dressed in a Diane Von Furstenberg gown -- spoke with ET about how privileged she felt to be participating in the anti-harassment movement, Time's Up, by wearing the color of the evening: black.
"I'm happy to be here standing in solidarity with so many other women using their powerful voices to create change," she said, adding that she looks up to Reese Witherspoon. "I wanted to be a lawyer for eight years after I saw Legally Blonde."
'The Handmaid's Tale' Star Madeline Brewer Wanted to Be a Lawyer Because of Reese Witherspoon!
Jonas also looked dapper at the Golden Globes in hisall-black Versace tuxedo, and was thrilled to have his older brother, Joe, as his date. Upon speaking with ET about his Golden Globes nomination for Best Original Song for Ferdinand's “Home," he noted how "special" it was to have his sibling sharing the moment with him.