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FORMER Doctor Who stars David Tennant and Matt Smith decided to have a face off to see who had the most fans as they appeared at competing sci-fi conventions in the US and Australia.

Bathgate born David and his former sidekick Billie Piper were taking part at the Wizard World Comic Con Philadelphia in the US while Matt, and former companions Freema Agyeman and Alex Kingston were in Brisbane attending the Whoniverse Five City Tour in Australia.

The fun battle of egos began when David and Billie recorded a message for the others claiming: “We’re killing it up her in Philly. They love us in Philly. I think they prefer us to you. That’s very much the vibe that we’re getting.”

Matt and his posse refused to take the claims lying down and shot a video of themselves in front of rows of cheering Australian fans.

(Image: Twitter)

Matt said: “Tennant, Piper hello. We see your video and we raise your video dude.”

Alex added: “Our video is so much better than your video.”

David then responded with another video saying: “Frema Alex, So you sent a video from your Australian convention - oh look at us we’ve got thousands of friends here - all cheering and whooping and showing off. Well I’m in Philadelphia and behind these walls is all of Philadelphia , about 4.5 million people ready to tell you how popular we are..”

It’s not the first time Matt and David have shown competitive tendencies - although it is the first time off screen.

On screen, for Doctor Who’s 50th anniversary special the tenth and eleventh Doctors were seen comparing the relative merits of their screwdrivers and tackling the age old debate as to whether size matters.