Later a fan snapped Gaga and Dan flirtatiously chatting at the bar, posting the pic on social media.
Lady Gaga was first linked to Dan back in July, just six months after her split from Christian Carino.
The pop star was seen enjoying a romantic lunch date at LA's Granville restaurant where they threw caution to the wind, sharing a public kiss while sitting on the balcony of the Studio City restaurant.
A fellow patron at Granville told People that the couple were "kissing as they spoke really close up."
"She had a table in the front near the sidewalk, so she was clearly okay with being seen. She seemed very happy when interacting with the guy she was with."
Another source said "She seemed confident and in a good place."