Leggy Sienna Miller flashes her limbs in summer frock as she keeps warm in a fuzzy jacket

She is always at the forefront of fashion, but even Sienna Miller seemed confused about what to wear during the season shift this week.

The actress decided upon a cross-seasonal outfit which saw her bare her legs but keep warm with a fuzzy jacket on a night out in London last night.

Sienna dined with a group of friends who came to cheer her on at the Theatre Royal Haymarket, where she is starring in Flare Path.

Sienna Miller shows off her legs in a cab as she heads home last night

A group of pals including model Poppy Delevigne watched the West End play and then left with the actress, 29, afterwards.

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They went for a late-night dinner at Sienna’s favourite restaurant, J Sheekey, in Covent Garden.

Sienna teamed her grey print frock with slouchy grey boots and a white faux-fur jacket.

Sienna was cheered on by friend Poppy Delevigne from the audience at her play Flare Path

Sienna dined with some friends who came to see her at the Theatre Royal Haymarket

Sienna will be starring in the WWII play, written in 1941 by Terence Rattigan, until June 4.

The production is set in a hotel near an RAF Bomber Command airbase during the Second World War.

Following the play she will be heading to Michigan to star in The Trials of Cate McCullough alongside Kate Beckinsale.

Sienna was in high spirits as she left J Sheekey restaurant

After that she is scheduled to star in Just Like A Woman, a drama about ’a Chicago who housewife runs off to Las Vegas to compete in a belly dancing competition.’

Sienna is rumoured to be dating The Boat That Rocked star Tom Sturridge, after she split with Jude Law in February.

The pair have been spotted together in London and were ’all over each other’ during a recent dinner date, the Mail On Sunday reported last month.