Sienna Miller stepped out sans outerwear in NYC yesterday. She wore bright blue pants and a t-shirt to grab lunch at Cafe Cluny during a warmer city day. Sienna has been staying busy in the city while her fiancé, Tom Sturridge, works on his new play, Orphans, which just opened for previews on Broadway. The play has been getting a lot of attention after Shia LaBeouf was reportedly fired from the production and replaced by Ben Foster. Shia sat front row at the play's first show on Tuesday, which caused quite the stir as he apparently had not informed the production he would attend the performance.