The actress appeared to have shrugged off criticism for suggesting she would have preferred 12-year-old Ronan Parke to win the show instead of singer Jai McDowall and was all smiles as she left the celebrations at the Dorchester hotel.
Her party outfit was that perennial fashion fave - the LBD - although plenty of ruffled detailing on the skirt and a bow on the strap prevented the look from being dull.
In keeping with the asymmetrical look, Amanda accessorised with one uber-long drop earring as well as gold pumps and matching nail polish.
One thing to note though - from this pic it looks like she matched her outfit colour scheme to the Dorchester's revolving door. Oops!
What do you think of Amanda's party style?