It's British model and actress Tamsin Egerton, who costars with Josh Hartnett in futuristic fantasy flick Singularity!
Josh reportedly brought the UK chica stateside recently for a birthday party at Icehouse restaurant in his native Milwaukee!
"Josh doesn't usually bring his girlfriends home, so this one must be special. He's really into Tamsin."
Ooooo things are gettin' for serious!!
And boy has moved from one leggy blonde to another… could it be that Joshy likes to see blonde locks when his eyes are focused down yonder?!
[Image via WENN.]