Chris Pizzello/Invision/AP file photoSports writer Bill Simmons and ESPN will part ways after nearly 15 years of

Why hasn't anyone seen Richard Simmons in nearly a year?

Come back, Richard Simmons. We miss you.

TMZ raised the alarm Thursday that our greatest living fitness personality hadn't been seen in public for nearly a year. No teaching classes at his Slimmons studio in Beverly Hills. No TV appearances in short-shorts. No word on the long-awaited follow-up to “Sweatin' to the Oldies Vol. 5.”

Sources told TMZ that Simmons, 66, is battling depression related to his injured left knee, which doctors have said requires a full replacement. A nervous Simmons has reportedly been putting the surgery off all year.

Wherever Simmons is, he has Internet access and was aware of people's worries on his behalf.

“I am so touched by the outpouring of love and concern I have received today,” he wrote on his Facebook page Thursday afternoon, adding that his injury “is keeping me from doing what I truly love to do and that is to teach classes around the world.

“Make sure you keep sweatin'!,” the famously effervescent fitness guru couldn't help adding.

LORDE SCHOOLS DIPLO

DJ and music producer Diplo has decided his opinion on pop star Taylor Swift's posterior is important. And lo, justice was swift (Swift's?).

“Someone should make a kickstarter to get taylor swift a booty,” the DJ tweeted Wednesday.

After a Diplo fan started a fundraising campaign (it had raised $85 by Thursday evening), Diplo faced a backlash from fans of the svelte singer.

It was Swift's BFF Lorde, though, who got the last word.

“Should we do something about your tiny penis while we're at it hm,” the 18-year-old New Zealand chanteuse tweeted. Burn.

QUICK TAKES

Late Tenants Union leader Ted Gullicksen, who helped save numerous San Franciscans from eviction, will be remembered in a memorial service at Mission High School at 2 p.m. Sunday. … “The Social Network” screenwriter Aaron Sorkin told the “Today” show Thursday he's sorry the film hurt Mark Zuckerberg's feelings. The CEO of Menlo Park-based Facebook had said the film “just kind of made up a bunch of stuff that I found really hurtful.”

HAPPY BIRTHDAY

Pop singer Yuna is 28. … Drummer Travis Barker of Blink-182 is 39. … Actor Josh Duhamel (“Safe Haven”) is 42. … Singer Jeanette Jurado of Exposé is 49. … Actor Patrick Warburton (“Seinfeld”) is 50. … Rapper Rev Run of Run-DMC is 50. … Actress Laura San Giacomo (“Just Shoot Me”) is 53. … Pianist Yanni is 60. … Zydeco accordionist Buckwheat Zydeco is 67.

Got scoops or Bay Area celebrity gossip? Email scoop@sfexaminer.com.

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