Birthday buddies

I've assembled this collection of mug shots of famous personages because they just happen to share a birth date with yours truly, and that day is today. To give you an idea of my age, I'm quite a bit younger than the first four, but a little older than the fifth. And just to strain your brain on a Monday, can you name all of these people? Don't worry if you can't; the answers are below.

Birthday buddies, left to right: Adam West, who forever typecast himself by playing Batman on the popular television series in the 1960s; Cass Elliot, one-fourth of the rock group The Mamas and the Papas; Leslie Hornsby, the first fashion model to become more famous than the threads she displayed, aka "Twiggy;" Singer-songwriter Paul Williams, whose heyday was in the 1970s and 1980s; current country music singer Trisha Yearwood. What can I say, they all picked a great day for a birthday.