Cara Delevingne and girlfriend St. Vincent didn't waste a minute enjoying a sunny Saturday in LA -- just as Cara touched down at LAX, St. Vincent (nee Annie Clark), picked her up and the two scooted off to Malibu in a Porsche convertible for a sushi lunch at celeb hotspot Nobu.

There were reports of the two possibly being engaged back in February, but there's still been no official announcement. Cara and Annie are said to have started dating back in December 2014, which means they're coming up on a good year and a half together -- an eternity when two people are young, in the spotlight and trying to keep a relationship together!