Matt Siegel celebrates his 35th anniversary as host of KISS 108’s “Matty in the Morning” on Tuesday, and wouldn’t you know he’s off this week. That’s right, the 65-year-old Marconi Award winner and his cohorts Billy Costa and Lisa Donovan aren’t around to celebrate the on-air birthday. (CEO of iHeart Bob Pittman and Ryan Seacrest checked in last week.) In an e-mail Monday alerting us to the anniversary, station execs cited Siegel’s “never-ending charm and unique appeal” as reasons for his high ratings and longevity. And here we thought it was his peevishness and willingness to poke fun at himself.Names can be reached at email@example.com. Follow Mark Shanahan on Twitter @MarkAShanahan.