Just imagine if 10 had met Amy. XD
They would be all flirty and 10 would probably be asking 11 if he's with the Sexy Ginger.
10 would then flip out when he finds out about 11 turning her down.
Be something like
"ARE YOU MENTAL?! YOU DAMN TWIT! GINGER - SEXY GINGER! OH GOD I'M AN IDIOT IN THE FUTURE!"