Heroes star Hayden Panettiere has revealed that she is having a 'blast' while filming Scream 4. The actress was spotted laughing with co-star Emma Roberts, 19, as the pair took a break from filming in Detroit. Talking about the movie, Panettiere told MTV News: 'For an audience that is so well-versed in Scream [films] and in what happens and who becomes the killer, it's trickier to throw them a curveball.'

She added: 'I think they've done a really cool job with the script, [and] we've had a blast on it.'Scream 4 is the fourth instalment in the slasher film series and is scheduled for release in April 2011.