Thanks to those who submitted captions, here are my top three:
In a picture expected to be published in tomorrow's News of the World, it is suspected that John Barrowman has challenged David Tennant to a staring competition. After a brief flex of the fingers and a smile that only Tennant could possibly achieve, he replied "Bring it on."
By Doctor Who Notes - well done!
David: Here is my invisible potted plant. I shall call him plant, and he shall be my plant.
Don't look at me like that, John, I know what you're thinking.