As the pop star-turned-fashion designer presented his William Rast collection at New York Fashion Week on Wednesday, the pretty film star supported her man, watching from the front row alongside Justin's mum, Lynn, and step dad, Paul.
And his mum had nothing but praise for her son's love, describing Jessica as "amazing" and "one of us."
"She's so down-to-earth and her family is great," said Lynn, who explained that the couple make it work because "they're both very funny and creative."
When asked if the Valentine's Day star is "the one" for her son, Lynn said, "You should ask him. I've thought that before."
Lynn said she hopes to be a grandmother soon, but added, "They're young. They have plenty of time."
Though mum described the handsome duo as "pretty openly affectionate," Justin and Jessica have rarely stepped out together in recent months.
But the pair appeared to confirm her words on Thursday as they were all smiles, cozing up in the front row of the Paris68 runway show.