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At the Sephora Celebrates Ten Years of Glamorous event, the pair kept mum, but Lohan's mom Dina gushed about Ronson.
"I love Samantha," Dina Lohan told reporters. "She's like a child to me. They're great friends and as long as my daughter is happy and healthy, it is what it is."
Ronson, wearing her usual skinny jeans and shirt, spun a mix of '80s tunes and current hits throughout the night, and Lohan, in a slinky multi-colored sequined dress, jammed alongside her.
Lohan spent the evening, drink-free, texting friends on her phone, playing with Ronson's deejay equipment and posing for pictures.
At midnight, the two left together, holding hands.
