Donna Noble does not knock. Especially not when an old friend who is supposed to be dead has arrived and whisked off by the Doctor without even so much as an attempt to meet up. So you can sure bet she blusters right in, having ditched the Welcome Center in a rush.

She's out of breath, but that doesn't stop her from rushing right over and joining the group hug. Donna's own family just keeps getting bigger and she'll be damned if she's not going to jump right in and enjoy it.