SMILLER040808_01.jpg

SMILLER040808_06.jpg

Sienna Miller SMILLER040808_16.jpg

Factory Girl star Sienna Miller was speeding around Hollywood - with someone who is NOT her boyfriend Rhys Ifans - in her convertible yesterday. Sounds fun!

Well, not if you're Sienna Miller. Despite being ridiculously stunning, Sienna's also a bit of a grouch. Smile, Sienna! You're rich, famous and beautiful - act like it!