Miley Cyrus and "Twilight" star Ashley Greene lived it in up Paris this weekend -- where they splashed around the fountain at the Trocadero while filming their latest flick.

The girls, plus a few other people from the cast, were shooting their movie "LOL" -- which also co-stars Demi Moore, who was MIA.

These two probably have a lot to talk about on set -- Miley used to date Nick Jonas, Ashley is rumored to be dating brother Joe right now.

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