Thorne showed quite a bit of skin in a lacy black bralette and distressed, dark high-waisted skinny jeans, which she paired with a leather jacket, chokers, a body chain and black fringed booties.
The redhead and her longtime pal looked like more than friends during their outing, with both giggling a ton and putting their arms around each other. The adorableness continued inside, where an eyewitness noted that "they seemed to be in good spirits" as they "couldn't stop smiling and laughing together."
The eyewitness also hinted that the two were more than just friends, telling ET that they held hands as they entered the L.A. Live parking garage after their dinner.
Rumors swirled last year that Thorne and Posey were an item after they were seen linked arm-in-arm, but both shot those down.
"It baffles me why rumors are made up about who I am dating when I've always been upfront and open in my personal life," Thorne tweeted in April.
Then, two months later, Posey, 24, told HuffPost Live, "Her boyfriend [Gregg Sulkin] is actually good friends with me, so we're definitely not dating."
Sulkin and Thorne broke up last month, however, giving a fresh reason for the new round of relationship speculation between her and Posey. That, and all that PDA. That's always going to do it.
Shortly after her recent breakup, the former Disney Channel star revealed that she was bisexual, an admission that received plenty of love from her fans. "Aww thank you for all the accepting tweets from everyone. I love you guys," she tweeted several hours after answering a follower's inquiry, adding the hashtag "#pride."