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Sienna Miller is now a redhead, talks about her year's highs and lows


UPDATED FEBRUARY 7, 2019 7:40 AM EST

Sienna Miller traded her signature blonde locks for a freshauburn 'do, surprising fans on Tuesday night as she celebrated the launch ofsister Savannah's new clothing collection for British department storeDebenhams.

Looking virtually unrecognizable with her dramatic newmakeover, the 33-year-old actress showed off her new look with an over-sizedgrey sweater from her sister's new collection, Nine by Savannah Miller and teamedit with black skinny jeans and a pair of tan suede peep-toe mules. The bold new look is part of her makeover for her latestrole in the upcoming movie The Lost City of Z, which she's currentlyfilming in Northern Ireland.

Sienna Miller helped her sister debut her new clothing collection for a British department store Image: Getty Images

Despite her busy schedule, the Mississippi Grind starstill makes plenty of time for family. Savannah recently revealed exclusively to HELLO! that sheturned to Sienna for advice when she was creating her new designs. "We do that anyway because we're sisters and bestfriends," she said. "I did ask for her opinion about certain things.She always is in agreement, and I really respect her style."

The mother of three also said that fashion now takes abackseat to their other important role as mothers. "We don't really have time for that, beingmothers," she admitted. "Neither of us spend hours discussing ourstyle at all, it's more about what we like and wearing things we like."

Sienna took a break from filming in Northern Ireland to support her sister, Savannah Photo: Getty Images

Sienna recently opened up about the “curse of motherhood” inan interview with British Vogue. She appears on the magazine’s October cover.Daughter Marlowe was born in 2012, six months after the actress announced her engagementto actor Tom Sturridge. The two split this summer.

"It's been really quite overwhelming recently, just with the volume of everything going on," she explained. "Everything is shifting. It's actually been the s---tiest year, and amazing. It's always yin and yang. I feel like if you're excelling in one area, it's hard to manage both, and I do feel like the work is going really well."

Sienna opens up about motherhood in the Mario Testino shot issue

For the British beauty, she has had success after success starting with Fox Catcher and American Sniper and has several more movies set for 2015. "Obviously when you have a baby it's the mostincredible experience but your life is also catapulted into this chaos and youare exhausted. I could literally get on this table and fall asleep," she continued. "I'd like to be better at managing things; I'd like to be more super — although we're never going to feel it, even if we are. That's the curse ofmotherhood — we just run ourselves ragged. I'm just trying to get a sense ofwhat that guilt is. I sometimes feel like it's a totally invented emotion. It'sstrange to be punishing ourselves this way. It's not healthy."