Awww, remember how nervous you were when you were learning to drive? I was 14 and I'd just stolen my mom's car to go see my boyfriend. Wait, probably shouldn't talk about that.
Anyhow, even though Sienna clearly likes to get her drink on and party late into the night - chica is taking driving lessons in London and was snapped doing so. I IDMb'd her and didn't find anything about needing to know how to drive for a film so she must just thinks it's time she learned.
Check out the tattoo she got during her stay in NYC a bit ago.