I watched the four part miniseries ARCHIE today....a British series about Cary Grant.
Of course the lead actor wasn't nearly as handsome as Cary - but he did a pretty good job of it.
The woman who played Dyan Cannon was uncanny in her impersonation and at times it seemed that she WAS Dyan.
There were several celebrity impersonations. The most egregious were the supposed Alfred Hitchcock, Grace Kelly, Doris Day, and MOST unfortunate, Audrey Hepburn.