Arriving for work in the London West End production of Shakespeare’s As You Like It with her flashy engagement ring missing from her left hand, Miller is spurring rumors that she has split with fiancé Law, who has publicly admitted to a steamy affair with his children’s nanny.
Despite personal drama, the 23-year-old actress – with two bodyguards at her side – arrived at Wyndham’s Theatre around 6:20 p.m., more than an hour before showtime, using a front entrance to outwit paparazzi gathered at the back.
Onstage, her voice seemed strained at times, but Miller remained poised through all three hours of the sold-out performance. The New York-born and classically trained Miller plays Celia, the cousin and friend of main character Rosalind.
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After receiving a warm ovation during the curtain call, Miller smiled slightly and quickly wiped her face with both hands as she hurried off stage. Draped with a towel, she fled the theater without comment only minutes later.
This week’s Sunday Mirror first reported that Law, 32, and Daisy Wright, a 26-year-old au pair, had a steamy affair in March while Law was filming All the King's Men in New Orleans.
In an eye-opening statement that followed the story, Law expressed his "sincere regret" over the relationship, saying: "I am deeply ashamed and upset that I've hurt Sienna and the people most close to us. …There is no defense for my actions, which I sincerely regret and I ask that you respect our privacy at this very difficult time."
A representative for both Law and Miller tells PEOPLE that she has no comment beyond Law's statement.
According to reports, Law’s ex-wife Sadie Frost hired Wright. Law – named PEOPLE's Sexiest Man Alive last year – and Frost had been married from 1997 to 2003. They have three children.
Law and Miller, 23, who became engaged last Christmas, met on the set of the 2004 movie Alfie.