The two have been attached at the hip the past month and were recently seen getting all lovey-dovey at dinner in London this past weekend as well as taking a romantic coffee stroll together.
Are these two actually serious?
The U.K.'s Daily Mail reports the duo were "all over each other" during dinner, according to witnesses at the Dorchester's China Tang restaurant.
Apparently Sienna was feeding Rob Pattinson's BFF noodles and dumplings in between kisses.
Gag. Yes, these two are both super hot, but couples who feed each other are the worst!
Sturridge, 25, was rubbing Sienna's shoulders before sources at the restaurant claim Sienna got "rather tearful" and they left the restaurant abruptly.
Somehow, that fact Ms. S is a tad dramatic doesn't surprise us.
Sienna is performing six nights a week in the West End production of Flare Plath.
What a lucky be-yotch Ms. Miller is! And smart. Of course, she plants herself on one of the hottest rising stars around.
According to sources, Tom and Sienna have been friends for a while but lost touch when she was cavorting around with Jude Law (the most recent time).
Then again, who are we kidding, Sienna and Tom are clearly not in it for the long run.