Lindsay Lohan keeps on having a good time without her family. Still energized from an all-night, booze-free party Thursday, she arrived at new Flatiron nightspot Riff Raff’s at around 1 a.m. Friday morning with a girlfriend. “She was clutching onto her signature can of Red Bull and stayed until almost 2 a.m.,” our spy said. “She looked like she was in a partying mood. It didn’t seem like she was ending the night there.”

PHOTOS: LINDSAY LOHAN

Careful to show she wasn’t drinking, “she kept her can of Red Bull in full view of other partygoers,” we’re told. She was later spotted at the Top of the Standard, where she left at 3 a.m. But Friday, it was back to being the family golden girl — Lohan headed out for a day with her mom, Dina, and her brothers and sister.