Sienna Miller has ditched her grungy style to make a return to the boho look which made her famous.

The actress who is dating fellow actor Rhys Ifans was seen out in Los Angeles yesterday wearing a thigh-grazing ruffled mini-dress, and boots, hugely reminiscent of the boho-look which propelled her to style icon status.

Sienna's brown tiered dress made a refreshing change from her less glamorous wardrobe of late, which appears to be inspired by boyfriend Rhys' slacker style.

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In with the old: Sienna's on-trend ruffled dress is a welcome change from her recent descent into grungy fashion. She showed off her look at LA's trendy Urth Cafe yesterday

The 26-year-old actress and Welsh-born Rhys, 39, were both seen dining at coffeehouse Urth Caffe in West Hollywood.

The trendy eaterie is fast becoming as famous as its patrons, having been dubbed a prime-spot for star-spotting by the Los Angeles Times.

Sienna and Rhys have been inseparable since they started dating in August last year.

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Fashionista: It was just like the old days as Sienna turned heads in her frilly outfit yesterday in LA

The couple have enjoyed a number of holidays and now the actress has decamped to LA, with Rhys in tow, as she films new movie, G.I. Joe, which co-stars Dennis Quaid and Channing Tatum.

"This is definitely not an independent film — this is big-budget stuff... I finally get to really kick some butt."

Inseparable: Sienna and Rhys have decamped to LA while the actress films new movie GI Joe

Sienna's style of late appears to be influenced by boyfriend Rhys, seen here flying to Los Angeles last week

The 26-year-old began shooting in Los Angeles last month.

In the film she plays the villainous Baroness - a femme fatale skilled in espionage.

The actress is rumoured to have gained 5lbs and has started an intensive fitness training in preparation for the role.

She has said: "I've started taking boxing lessons, and I've also had to learn how to fire guns with live ammunition.

"I'm a baddie, running around kicking everyone while wearing tight, thigh-high boots.

"I'm getting muscles everywhere."

Next, Sienna is scheduled to star alongside Sean Bean in the romantic comedy A Woman of No Importance.