Sinead Keenan in Tennant Finale

It's been recently revealed that Sinead Keenan will appear in the final two specials to air this and next year, which lead up to the Tenth Doctor's regeneration.

She is known for her role as Nina in BBC Three show, Being Human. The creator of Being Human, Toby Whithous recently told SFX Magazine;

“Russell T Davies would email me after every single episode, going, ‘I’m loving it!’. He absolutely fell in love with Sinead who plays Nina so he’s given her a part in David Tennant’s last two parter.”

In being human, Keenan worked alongside Russell Tovey, who played Midshipman Frame in 2007's Voyage of the Damned.

What do you think of this casting news?