Catherine Tate with David TennantCatherine TateCatherine Tate's having a little trouble of late.

And it seems that trouble is of the boob variety.

The class act comedian is warming up for her starring role in BBC sci-fi series Doctor Who.

But it appears that not everything is going to plan on the set.

And it's all down to those damned bazookas.

Caz, who plays assistant to David Tennant's Time Lord, has admitted to suffering a few technical hitches while shooting the all-important action scenes.

She told The Sun: "I always struggle to keep up with him (David Tennant) because he hasn't got breasts like I have. Breasts aren't built for running."

What's a girl to do, eh?

Buy a sports bra maybe? Or perhaps request a five-second head start?