Michelle Williams and Ryan Gosling lock lips while filming a romantic scene for their new movie Blue Valentine.

The pair play a married couple in the upcoming flick, which charts their relationship over the years by cross-cutting between different time periods.

In real life, Michelle has been dating Being John Malkovich director Spike Jonze for nearly a year, whilst Ryan is currently single after splitting from on/off girlfriend Rachel McAdams last year.

The on-screen Valentines puckered up on set in Queens, New York, on Wednesday.

Stars who fell in love on set