Jon Hamm has been a big part of Saturday Night ... wondering why he still doesn't have the Five-Timers Club smoking jacket. Hamm has surprisingly only hosted the show four times over the years ...

Thank you, Jon Hamm and Jimmy Fallon ... of Stapp’s signature shoulder-length tresses and bright yellow jackets with black leather pants. As they sang their rendition of the 1999 song, stood ...

Jon Hamm returns ... Meryl Streep. Hamm's gig this weekend will put him in the SNL four-timers club. One more and he'll claim the coveted five-timers club embroidered jacket and enjoy access ...