Mary Hart's final taping of Entertainment Tonight came with plenty of bells and whistles -- in the form of a surprise party!

PHOTOS: Mary Hart Through The Years

A trio of Hart's former co-hosts -- John Tesh, Bob Goen and Robb Weller -- were on hand Thursday  to honor their one-time colleague, while second-generation singer Natalie Cole sang her hit Unforgettable for the veteran TV personality.