The Collaborative International Dictionary of English v.0.48:

Adorableness \A*dor"a*ble*ness\, n.
   The quality of being adorable, or worthy of adoration.
   --Johnson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adorableness
    n 1: extreme attractiveness [syn: adorability, adorableness]