Filling the grounds of the chat show host's impressive homestead with a surfeit of spectres, creatures and assorted monsters, the Area 51 team also carried out a stunning makeover of his mansion to turn it into a citadel of spooks.
The 'Castle of Creeps' makeover at Ross' Hampstead house was a huge hit with the A-list celebrity guest list as well as thousands of the public who flocked along to join in the fun at what has rapidly been established as one of THE celebrity events of the year in the UK.
And as in previous years, Ross called upon the specialists from Area 51 to serve up tricks and treats for all concerned on All Hallow's Eve.
This year's guest list read like a celebrity's who's who as the famous gathered to strut their stuff in a range of ghoulish costumes and garish make up jobs.
Among those who turned up were supermodel Kate Moss who showed as a weird gothic ghost, singer Nicole Scherzinger who appeared in a sexy Catwoman costume, TV's Holly Willoughby who turned up as a creepy butterfly woman, comedian Stephen Merchant, Lilly Allen, Simon Pegg, Claudia Winkleman, Millie Mackintosh and husband Professor Green, Charlie Brooker, Jimmy Carr, Noel Fielding, Tim Minchin, Dara O'Brian, David Baddiel, Jack Whitehall, Gary Lineker as well as many others.
Among the various creepy characters from Area 51 in attendance were fauns, killer clowns, witches, demons, King Kong, ghoulish chimps, ghostly figures plus stilt walkers, fire performers and much more beside.