Gary Dell'Abate

Howard Stern's birthday party Friday in New York was packed with celebs like Jimmy Kimmel and Gary Dell'Abate .. and most got him the same thing for his big 6-0 -- NOTHING! The late night host and Stern producer were heading into the big bash thrown by SiriusXM Radio ... and they proudly walked in…

Gary Dell'Abate went on "Kimmel" last night -- and finally got a chance to make up for that famously terrible first pitch he threw at a Mets game last year ... instead, he beaned an audience member in the head. Juuuuuuuuuuuuuuust a bit outside.