Naomi Watts struggled acting alongside her fiance Liev Schreiber on the set of The Painted Veil - he was a distraction. The 39-year-old - who now has a son, Alexander, with the actor - was so keen to impress her co-star she lost focus on her performance. She says, "It was a challenge. I'm not even a big fan of having friends on set - let alone someone I like! It can blow my concentration. We'd only been together three months and at that stage, you are still really trying to impress each other." The pair, whose son Alexander was born in July (07), are set to wed next year (08).