The 24-year-old singer welcomed son Freddie Reign into the world ten days ago. Despite still being new to the world of parenting, Louis decided to take a break from daddy duty to enjoy a night on the town with his girlfriend.
One Direction singer Louis went for a casual look in a pair of black trousers, skull-print T shirt and stonewash denim jacket, while birthday girl Danielle opted to flash a bit of skin in a cropped black top, low-slung black trousers and a pair of heels, with a red jacket adding a splash of colour.
The pair looked delighted to be in each other's company, strolling along happily hand-in-hand as they left a local restaurant after having a bite to eat with friends.
The evening was something of a double celebration, as in addition to the birthday balloons strung up outside the eatery, there were also ones featuring the slogan "It's a boy!"
Danielle beamed with joy as she held on tight to her beau, seemingly unfazed by the fact that he recently fathered a child with another woman.
Despite the fact that he and Freddie's mother Briana Jungwirth are no longer romantically involved, Louis is thought to currently be living with the American stylist in rented accommodation in Calabasas, California, to help her get used to having a newborn.
"Although they're not romantically involved, Louis thinks Briana is a great woman and will be a fabulous mother," a source told MailOnline previously.
"Louis has been helping Briana financially and is prepared to get stuck in with all the tasks that caring for a baby demands."
Danielle had celebrated her landmark birthday with her girlfriends earlier in the week, with the ladies apparently having organised a celebration for the actress.
Wearing a cute red and white minidress, Danielle looked incredible for the occasion, and wrote on Twitter after the evening: "Truly the most wonderful night. Thanks for making me feel so special. Will never forget it."
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