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Justin, who was waiting in the wings, is no doubt a major factor behind her new-found glow.
The pair have virtually been inseparable since they got together in the summer and are often pictured in matching black outfits and satisfied smiles.
Despite their togetherness, Jennifer is coy about giving away to many details, recently telling Elle "If it’s meant to be, it’s meant to be.
"I’m at peace with whatever the plan is".
Although her new beau didn't pose with her on the red carpet at the Women in Hollywood event, he later caught up with his girl backstage, as she chatted to Reese Witherspoon.
Also upping the glam factor was Matthew McConaughey’s stunning partner, Camila Alves, Slumdog Millionaire star Freida Pinto and Naomi Watts.
Star style: Jen tries out a sexy new look
All the news as Duchess Kate's due date draws close...