Sienna Miller looks radiant as she is joined by 'fiancé' Lucas Zwirner at ...

She was recently reported to have got engaged to her toyboy beau Lucas Zwirner.

And Sienna Miller looked in good spirits as she stepped out with Lucas at the 72nd Annual Writers Guild Awards at the Edison Ballroom in New York City on Saturday.

The actress, 38, cut a stylish figure at the event, donning a cream, long-sleeved dress with a stripe detail and a pair of gold hoop earrings.

Event: Sienna Miller, 38, looked in good spirits as she stepped out with Lucas Zwirner, 29, at the 72nd Annual Writers Guild Awards at the Edison Ballroom in New York City on Saturday

Event: Sienna Miller, 38, looked in good spirits as she stepped out with Lucas Zwirner, 29, at the 72nd Annual Writers Guild Awards at the Edison Ballroom in New York City on Saturday

Adding height to her frame with a pair of gold heels with ankle straps while she accessorised with a peach clutch bag.

Styling her blonde locks into an updo, Sienna took to the stage during the show to help present some of the awards.

Lucas looked dapper for the evening in a black blazer and matching trousers which he paired with a crisp white shirt. 

Sienna was spotted wearing a diamond ring last month but has since appeared eager to cover it up when around photographers.

Fashion: The actress cut a stylish figure at the event, donning a cream, long-sleeved dress with a stripe detail and a pair of gold hoop earrings

: The actress cut a stylish figure at the event, donning a cream, long-sleeved dress with a stripe detail and a pair of gold hoop earrings

Friends confirmed to The Mail on Sunday that Sienna said 'yes' when Lucas popped the question last month.

The couple, who began dating last year, are said to be blissfully happy together and have begun making plans for their .

She and Lucas, the editorial director of his father's art-based publishing house, David Zwirner Books, are understood to have moved in together in New York. 

Sienna was previously engaged to Tom Sturridge, who she split from in 2015 following a four year romance, and with whom she shares daughter Marlow, seven.

Style: Adding height to her frame with a pair of gold heels with ankle straps while she accessorised with a peach clutch bag

Style: Adding height to her frame with a pair of gold heels with ankle straps while she

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