Fling or Ring? Jude and Sienna

AKA: The most beautiful man in the world â„¢

Years racked up: 31

Known for?: Being impossibly good-looking, having a supposedly perfect relationship with ex-wife Sadie Frost, being a dad to three gorgeous children…oh and being a damn-fine and famous film actor too, to boot.

Is involved in a love thing with...

Who? Sienna Miller

AKA: London's latest boho-fashion-chick; a Very Lucky Girl Indeed

Years racked up: 22. But sometimes this is 21 and 24, so take your pick.

Known for?: Primarily being a very attractive piece of arm candy for Mr Law. But that should change once we actually see some of her films, like Layer Cake or the Alfie remake.

Romance rocketed when: they met on the set of Jude's film, What's it All About, Alfie? last summer. Following his messy break-up with increasingly erratic party-loving wife Sadie Frost, Jude's 'light was on' and Sienna got straight in there...

Make or break: Jude reportedly can't stand Sienna's smoking habit ("I love ciggies!" she coos) and has begged her to quit. So far, she hasn't.

Soppy speak: At the beginning of their relationship, a loved-up Sienna gushed, "Things couldn't be better, I'm really happy. He took me to Paris and we had the best time. I can’t remember being happier than I am now." Now a little more media-savvy, she’ll only say, "I'm nervous because I've seen what happens to relationships when you're doing this (acting)." Fiercely private Jude refuses to say anything about the romance. Spoilsport.

Biz Bitch says: This photogenic pair are a great match — they even resemble each other. Since the demise of Jude'n'Sadie, we've needed a super-glam London couple to fly the flag in Hollywood — we don't really dig Liam and Nicole - and Jude'n'Sienna will do very well, thank you. A tip for Jude — don’t worry about the Rogaine, love, just pop one of Sienna’s floppy hats upon your bonce...