Mary-Kate and Ashley Olsen Attend Rare Outing With Sister Elizabeth - Check Out the Pics!

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It's like The Adventures of Mary-Kate & Ashley: The Case of the Mystery Cruise -- only more glamorous!

Mary-Kate and Ashley Olsen posed alongside younger sister Elizabeth at the Chateau Marmont in West Hollywood on Tuesday -- an increasingly less rare occurrence, but still rare nonetheless. It makes sense when you know what the event was: The opening of the Elizabeth and James flagship store at The Grove in L.A.!

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Elizabeth and James is Mary-Kate and Ashley's clothing label, named after their sister -- the Avengers: Age of Ultron and Captain America: Civil War actress -- and their older brother ("for sale"), James.

WATCH: Mary-Kate and Ashley Olsen Turn 30! Look Back at Their Rise From Child Stars to Billionaire Fashion Designers

The 30-year-old twins looked chic as usual in near opposite ensembles -- Mary-Kate was sunkissed in all-black, while an icy blonde Ashley opted for a rose trench coat. The accessories are peak Olsen.

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This is the second time all three Olsen sisters have attended an event lately, following the CFDA Awards in June. Before that, they hadn't been photographed on the red carpet together since 2011. It should go without saying, they slayed the style game there too.

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Check out more shots of the Olsens at the CFDA Awards -- along with many more fashionable guests -- in the video below.