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Justin Timberlake, Jessica Biel, Forge

Simon Hare, Getty Images

Jessica Biel may have attended Sunday's Oscars solo, but the very next day she enjoyed a romantic birthday party dinner with her hubby, Justin Timberlake.

The gorgeous actress, who jetted out of L.A. the morning after the Academy Awards, reunited with her man in Miami on Monday to celebrate her 32nd birthday at The Forge restaurant.

"Justin and Jessica came in through the main door [around 9 p.m.], and they went directly downstairs to the wine cellar, which is private," a source tells E! News of the lovebirds, who were accompanied by Justin's parents, Lynn and Paul.

Justin Timberlake, Jessica Biel

Kevin Mazur/Getty Images for GQ

During the intimate dinner, J,T, and Biel "kept a low profile," according to the source. "They looked happy and comfortable."

As for the B-day meal, the source adds, "Chef Lee prepared an Italian wedding cake, because it's Jessica's favorite."

And yes, Biel got a birthday serenade from her pop star husband. "Justin sang a few lines of 'Happy Birthday' to Jessica," the source dished, adding that after the group took a tour of the restaurant together.

Yesterday, Biel took to Twitter to share a special message, writing, "Thanks for the birthday love! You guys know how to make a girl feel good. Or woman, I guess... Or close to middle aged woman? Ah, forget it."

—Reporting by Lindsey Caldwell