Lindsay Lohan got a blast from the past when she and her former flame Calum Best both showed up at the Effen vodka – sponsored opening of the Apple Lounge in LA on Aug. 14 (her ex Harry Morton also was on hand).

Asked what he thinks about Lindsay’s latest romance, with Samantha Ronson, Calum quipped, “I hope I didn’t turn her!”

Even though one witness says Lindsay tried her best to avoid Calum, 27, at the event, he insists he’s still friendly with the 22-year-old actress, whom he dated in May 2007, shortly before Linds entered Promises rehab in Malibu. “She’s a cool girl,” Calum said. “She’s better than she was, because at one point she was in a bad way.”

He said he definitely doesn’t have any hard feelings: “I wish her all the best with whatever she does. And if she’s with a girl, then good for her. In this day and age, it’s all good.”

Is Calum worried his friendship with Lindsay could make Sam jealous? “We’ll see. I don’t want to arm wrestle her girlfriend!” he joked.

Pics are from this same party, where he partied it up with Simon Rex.  Remember him?