Siegfried & Cassidy?

3/7/2007 3:20 PM PST
He wasn't mauled by a white tiger in Las Vegas four years ago, but "Partridge Family" star David Cassidy appeared in London looking exactly like flamboyant illusionist Roy Horn. Abracadabra! How'd they do that?!

The 56-year-old former 70s heartthrob was across the pond signing copies of his new memoir, "Could It Be Forever - My Story," while the magically recuperated Roy popped up last week at Elizabeth Taylor's 75th birthday bash in Las Vegas!

C'mon get happy!