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Louis Tomlinson, Danielle Campbell

Amanda Edwards/Gregg DeGuire/WireImage

Louis Tomlinson may be expecting a baby with stylist Brianna Jungwirth, but it appears the One Direction crooner is still dating other people.

A source exclusively tells E! News the 23-year-old pop star and The Originals actress, Danielle Campbell, visited the Hollywood hot spot Millions of Milkshakes on Sunday evening around 9 p.m.  

The insider notes Louis was "all over the girl" and that "he was being playful and all lovey towards her like couples do."

Together they ordered four milkshakes: one with Oreos and cookie dough, the "Celebrity" with Reese's Cups and cookie dough, the "Million Dollar" with Ferrero Rocher and strawberries and the last with Nutella.

Our source says Campbell paid for all four, and the duo sat inside the milkshake shop and watched the old footage of celebs creating their own personalized shakes as they waited.

A fan at the restaurant caught a snap of them sitting side-by-side, captioning the pic, "danielle campbell and louis tomlinson I agree" and later asking, "am I ever gonna let this go?"

This isn't the first time the two have hung out. A couple weeks ago Campbell's friend, Keelin Woodell, shared a photo of the three of them together while hanging out at Bootsy Bellows in Los Angeles.

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A photo posted by Keelin (@keelinsheawoodell) on

They both looked comfortable and happy together, smiling and sitting close as they posed for the group selfie.

Meanwhile, Tomlinson is expecting his first child with Jungwirth. Though the pair have already declared that they are not a couple, the pop star expressed that he will be a very "hands on" dad and remain by Briana's side throughout the pregnancy.

—Reporting by Holly Passalaqua