Another showed her looking ecstatic about the big day as she carried big pink balloons -- and wore matching pink pointed-toe stilettos.

LOS ANGELES, CA - DECEMBER 03: Ava Phillippe, Reese Witherspoon, Deacon Phillippe, Tennessee James Toth and Jim Toth attend the premiere Of Universal Pictures' 'Sing' on December 3, 2016 in Los Angeles, California.

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Reese Witherspoon, Oprah Winfrey and Mindy Kaling have taken some time out to enjoy the South Island before filming begins on A Wrinkle In Time on Wednesday.

The stars are in Wanaka this week to film the $140 million fantasy adventure film.

The trio landed at Queenstown Airport at around 8pm on Sunday and it is believed they are staying in a private Wanaka residence.

Monday appeared to be a recreational day for the stars and Witherspoon popped into Ritual Cafe around noon to purchase an almond cappuccino.

The two are her mini-mes in every way, from their blonde locks to their impeccable style. We're obsessed.) And although Deacon looks just like both of his parents -- Dad is actor Ryan Phillipe, Reese's ex-husband -- with the swooping hair and suit, you can't deny a resemblance to a young Leonardo Di Caprio!

"There's nothing better than celebrating my birthday with my wonderful kids! The "Big Little Lies" star shared several snaps from the celebration, including one of a gorgeous birthday cake adorned with blueberries and raspberries.

"I’m deeply sorry for the hurt and embarrassment I’ve caused to those close to me and everyone this has affected," she said.

"This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob.

Hollywood's reigning Southern sweetheart celebrated her 41st birthday this week, but as we all know, she could pass for half her age -- and it looks like her kids were blessed with the exact same genes!