Factory Girl co-stars Hayden Christensen, 24, and Sienna Miller, 24, are shacking it up together at a hotel suite in Louisiana. Sienna wearing Hayden's shirt should raise a few eyebrows. "Sienna and Hayden aren't doing a very good job of keeping their flirtations a secret. Everybody has been talking about it for a while and after the cast party on Monday they were acting like more than good friends," an insider reports. Above and below are pictures of Hayden Christensen returning from a trip to Dillard's (a retail department store offering fashion apparel and home furnishings from coast to coast) and grocery shopping before returning to the love shack with Sienna Miller.