Sienna Miller embraced the rising Chicago temperatures and ventured out in a floral sundress and Gucci bag for a trip to the liquor store with Tom Sturridge earlier this evening. Tom picked up a 12-pack of Miller High Life, which the pair carried on their merry way. Tom and Sienna, who are going four months strong, also grabbed drinks with Kristen Stewart a few weeks ago when she was in London to honor her On the Road costar Garrett Hedlund. Kristen has since also returned to the States, while Sienna's been juggling her Flare Path performances and first JewelMint collaboration. She's the latest to team up with the online retailer, following in the footsteps of Kate Bosworth, Rachel Bilson, and Mary-Kate and Ashley Olsen. Today, Tom and Sienna can toast to her latest fashion venture and to Tom's best friend Robert Pattinson, who earned four 2011 Teen Choice nominations this morning.