What a big little mess! Filming for Season 2 of the hit HBO drama Big Little Lies is underway, and tension between returning star Nicole Kidman and newcomer Meryl Streep has thrown the show into chaos. "Nicole and Meryl have had an epic falling-out," a source tells Life & Style.

"Nicole feels she’s the star of the show and is threatened by Meryl. Meryl’s picked up on it and the two have really gotten into it." Nicole, 50, won an Emmy for her portrayal of Celeste Wright on the first season of the show, and Meryl, 68, agreed in January to join the cast as Celeste’s mother-in-law, Mary Louise Wright.

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Adding a three-time Oscar winner to an already star-studded cast — what could possibly go wrong? "Their feud is affecting the entire series," the source says.

There have been discussions behind the scenes about how execs could "diffuse the situation," but nothing has helped so far. "Tension on the set," the source adds, "is at an all-time high. The way things are going, who knows if there will be a third season?"

Hopefully, it doesn’t come to that. Given all the twists and turns during last season, it’s likely that the story of these dynamic female characters will take more than a couple of more episodes to tell.