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Margot Robbie, Elle

Cedric Buchet for ELLE

Margot Robbie has quite an impressive résumé—it's so impressive, actually, that it's almost hard to believe she's only in her mid-twenties.

"People seem outraged that I'm 24," the actress, who turned 25 on July 2, tells Elle magazine's August issue. "People think I'm a decade older."

Tina Fey, who stars alongside Robbie in Fun House, has a theory on why the Australian star might come off as more experienced than her contemporaries. "Like a lot of actors who got their start on soap operas—Julianne Moore, Alec [Baldwin]—Margot makes great, strong choices but then is still very quick and flexible," she tells the mag.

Margot Robbie, Elle

Cedric Buchet for ELLE

Robbie isn't so career-focused that she misses out on fun stuff like other gals her age. According to Simon Van Zuylen-Wood, who interviewed Robbie for Elle, she and her longtime BFF/personal assistant Sophia happily rapped along to "a rather filthy Lil Wayne song" without missing a single word.

Margot Robbie, Elle

Cedric Buchet for ELLE

The Australian star also tells the mag about Rat Rat, the pet rat given to her Jared Leto's Suicide Squad character. According to Robbie, she kept the rat because, "If Harley [her character in Suicide Squad] got something from Joker [Leto's character], she'd probably cherish it."

Margot Robbie, Elle

Cedric Buchet for ELLE

Robbie didn't mind telling Elle about Rat Rat, whose diet reportedly consists of organic berries from Whole Foods. She did not, however, want to discuss her boyfriend Tom Ackerley, who she met on set of Suite Française in 2014 when he was working as an assistant director. "He was a third AD, he's now working as a second AD," she says, "and that's, yeah."

Fair enough! For Robbie's full interview, pick up the August issue of Elle when it hits stands July 21.