on Thursday night (April 27) at Golden Theater in New York City.
The 33-year-old actress was joined at the event by Tom Sturridge, Matthew Perry, and Samuel L Jackson along with his wife La Tanya Richardson.
"It seemed like it was only a matter of time," a source added to E! Miller was previously engaged to actor Jude Law, and started dating Sturridge in 2011.
According to Grazia magazine, a source close to the pair said: 'Tom has been telling his close friends that he and Sienna are going to get back together.
PHOTOS: Check out the latest pics of Olivia Wilde Earlier that day, Olivia took Instagram to share a super cute throwback picture with her three-year-old son Otis.
She's the original boho queen, and over the years Sienna Miller has retained her fashion icon title by maintaining her quirky look and ability to style both designer and vintage pieces effortlessly.
S Open on September 11 where the actress and the Oscar-nominated director, 49, caught a match between Tennis matches aren’t the only place the twosome have been spotted out.
The 34-year-old Brit showed off her director-turned-love interest at a Met Gala after party at the Boom Boom Room on May 2 in NYC.