(Cover) - EN Showbiz - Michelle Williams is crushing on Dominic Cooper.

The two stars appear alongside each other in My Week With Marilyn, about the relationship between Marilyn Monroe and Sir Laurence Olivier. They have become good friends on set, and recently attending a screening of Michelles movie Blue Valentine together in London. They were spotted laughing and joking, and it has been claimed Michelle loves flirting with her co-star.

Michelle is crushing on Dominic, a source told National Enquirer. Shes usually very reserved, but he brings her out of her shell.

The attraction is mutual, with Dominic said to be keen to see if a relationship would work. He has been single since splitting from Amanda Seyfried this year, while Michelles relationship with Spike Jonze ended in 2009.

Dominic is pursuing her all out now, the source added. Shes having a blast.

Michelle has five-year-old daughter Matilda with late actor Heath Ledger, who died of an accidental prescription drugs overdose in 2008. (C) Cover Media