True Blood star Stephen Moyer has one message for his blood-sucking rival Robert Pattinson – bite me!

Ahead of the second season of the HBO vampire drama, the 39-year-old actor has dissed the Twilight heartthrob's undead credentials.

In an interview with Marie Claire, he says of Rob: "He's a pussy! He's the Slim-Fast, Diet Coke of vampires."

Vampire fight: Stephen as Bill in True Blood (left) and Rob as Edward in the Twilight saga (right)

Despite the fighting talk, the pair have more than pretending to be vampires in common.

Vampire romance: Stephen with on- and off-screen love interest Anna Paquin (left) and rumoured couple Rob and Kristen (right)

If you believe the gossip, Rob is hooking up with on-screen love Kristen Stewart, whilst Stephen has been dating his True Blood co-star, Anna Paquin, for the past two years.

Cannes man!