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Kelsey Grammer wasn’t letting a foot injury slow him down -- he was cruising around London on a scooter like it was no big deal!

The "Frasier" star was all smiles despite rocking a cast on his leg, showing no signs of slowing down as he made his way through the crowds with the help of his trusty transportation Saturday.

Kelsey had one knee on the scooter for balance, and it looks like he probably knew he'd warm up after picking up some speed ... 'cause apart from a sweater and some jeans, the guy wasn't doing a whole lot to bundle up in the chilly British city.

It’s unclear how he got the injury, and it's definitely not the break he needed after wrapping up season two of his "Frasier" revival recently.

5:52 PM PT -- Tyler Perry has broken his silence over the death of Steve Mensch ... expressing his deep admiration and respect for his friend ... while noting how hard this time of year is for him with devastating losses.

"This time of year, grief meets me like an unwanted visitor, as tomorrow marks 15 years since the loss of my mother. It feels especially harder because I have lost so many friends and mentors this year, ranging in age from as young as 40 to 92. And today, yet another loss.

I’ve been trying to understand this tragedy all day—what went wrong with that plane. Steve loved flying, and he loved that plane; he took so much pride in it. I’m praying for his family as we all try to make sense of this heartbreak.

Life is but a moment; we are like vapors. Hold strong to the people you love AND TELL THEM!"

9:03 AM PT -- Tyler Perry Studios Studios has released an official statement on Steve Mensch's death.

“Steve was a cherished member of our team for more than 8 years, and well beloved in the community of Atlanta. It is hard to imagine not seeing him smiling throughout the halls. We will miss him dearly. Our heart goes out to his family as we all send them our prayers.”

Steve Mensch, the president and manager of general operations at Tyler Perry Studios, was killed in a single-seater plane crash in Florida on Friday night, a source close to the studios told TMZ.

Mark Withers -- a veteran actor who spend decades in the biz and appeared on such shows as "Stranger Things," "Magnum, P.I." and "Dynasty" -- has died.

In a statement to Variety ... Mark's daughter, Jessie, said the cause of death was pancreatic cancer ... and he died Nov. 22.

“He confronted his illness with the same strength and dignity he brought to his craft, creating a legacy of warmth, humor, and dedication, along with his remarkable ability to make every role unforgettable," Jessie said.

"Shazam!" star Zachary Levi and his girlfriend, Maggie Keating, are preparing for a very special delivery.

The couple is having their first child together and the two couldn't be happier!

Zachary was so excited, he jumped on Instagram Friday and posted a sonogram, showing their little bundle of joy, along with a photo of Maggie embracing him with a smile.

The week is coming to a close and it's safe to say it was an action-packed one for Hollywood's biggest stars ... as several fan-favorites hit the town for various industry events.

For starters, actor Evan Ross turned the Los Angeles premiere for "The Fire Inside" into a father-daughter date night ... bringing his and Ashlee Simpson's little girl, Jagger, as his plus one.

Of course, there was plenty of other star power at the premiere ... Michael B. Jordan, Chloe Bailey, Meagan Good and Jonathan Majors all stepped out -- looking as dashing as ever -- for the event, too.

The suspect who killed UnitedHealthcare CEO Brian Thompson handled his gun proficiently during Wednesday's shooting -- something that's painfully clear, according to a former FBI agent.

Jennifer Coffindaffer spoke with us on "TMZ Live" Friday and broke down the suspect's expertise -- pointing out how he used a silencer on the gun, fully aware it could cause jams, and cleared it like a pro without missing a beat when it did.

Watch the video ... Coffindaffer digs into the suspect’s firearm skills and breaks down what the 3 distinct shots reveal about the man behind the trigger.

Chuck Norris is in mourning ... because his mom, Wilma, is dead.

The "Walker, Texas Ranger" star just announced his mom's death ... saying she died Wednesday morning and "went home to be with Jesus."

Chuck is remembering his mother as "a woman of unwavering faith, a beacon of light in our lives" ... and he says "her love reflected God's grace."

Oprah was out and about in Los Angeles, rubbing elbows with fellow A-listers at a swanky dinner at the iconic hotspot, Chateau Marmont.

The talk show host was serving up serious style at the Brunello Cucinelli dinner Thursday, rocking a neutral blazer, crisp white shirt, and fringed tie.

Oprah was rubbing elbows with the big leagues at the dinner, chilling with Kevin Costner and Jon Hamm -- oh, to be a fly on the wall!

Ellen DeGeneres is making lemonade out of lemons ... with her skincare line that's got super ironic branding.

The talk show legend has a new ad out for Kind Science ... which is funny, considering she got canceled from Hollywood for being unkind. What's in a name, anyway?!?

Ellen's playing nice here though, at least for the cameras in her living room ... plugging her anti-aging products alongside Portia de Rossi.

Whitney Cummings says rejecting Sabrina Carpenter from "The Conners" was the best thing that could have happened to the pop star.

We got Whitney on Thursday at LAX and our photog asked the former 'Conners' showrunner about the time Sabrina tried to get on the show.

Whitney says Sabrina auditioned for the role of Harris Conner-Healy back in the day, but they ultimately passed because they were looking for someone with a darker energy.

Martin Lawrence's daughter is engaged to Eddie Murphy's son ... and Martin says he's going to foot the bill when they tie the knot.

The "Bad Boys" star revealed his plan to bankroll the upcoming wedding ceremony during an appearance this week on Big Boy's show, "Big Boy's Neighborhood."

Martin didn't exactly volunteer ... he says Eddie told him he has to be the one to pay because Eddie's already paid for 6 weddings for his kids.

Tyler Perry is all about one leading lady -- calling it a dream come true to work with Oprah!

We caught up with Tyler Wednesday, and he couldn’t stop gushing about directing Oprah for the first time in his new Netflix film, "The Six Triple Eight" ... making it clear that teaming up with the cultural icon is nothing short of incredible.

While Tyler’s a talented director in his own right, we had to ask if Oprah would crush it as a director herself -- it’s one of the few things she hasn’t tackled yet. Check out the video to hear his take!

Davina Potratz is chiming in on the ongoing "Selling Sunset" drama between Chrishell Stause and Nicole Young, as the two are filming together again despite Chrishell’s past claims she wouldn’t return to the show if Nicole did.

We got Davina out in Beverly Hills on Monday where she told us she wasn’t surprised by Chrishell’s return, saying it aligns with the show’s drama-filled theme.

She says she questions Chrishell’s threats in September to quit the Netflix show if producers brought back Nicole, saying she feels they were empty threats and possibly a grab for headlines in the press.

Wicked cool moment on Drew Barrymore's talk show ... she surprised "Wicked" star Ariana Grande with the original Glinda wand from the movie that started it all.

Ariana is a guest on Thursday's episode of "The Drew Barrymore Show" and a preview shows the moment Drew brings out the wand ... completely stunning Ariana.

Of course, Ariana plays Glinda in the new "Wicked" movie ... so it was only natural Drew pulled out all the stops to get the wand from the 1939 flick.

"Shameless" actress Emma Kenney just pulled off a heroic move -- swooping in to save a dog that was about to be euthanized.

Emma shared an IG Story of the cute pup being walked by an unidentified woman, explaining she and her BF, Conrad Hilton, stepped in just in time to rescue him minutes before he was set to be put to sleep ... and rushed him to L.A.'s no-kill shelter, Yogi's House.

Emma, a longtime animal activist, shared the clip to Michael Bublé's "Holly Jolly Christmas," making it clear that this pup's second chance at life is a Christmas miracle.

NFL star Chris Jones has already put it ALL on display in the past ... but he's got more to reveal to the world -- 'cause he's using his upcoming strip-tease performance to showcase what big boys can do onstage!!

The Kansas City Chiefs defensive tackle -- one of the best players in the league -- and a handful of fellow male celebrities took part in Fox's "The REAL Full Monty" special airing Dec. 9 ... and it's clear the three-time Super Bowl winner didn't take his participation in the big event lightly.

While Jones -- who famously had a wardrobe malfunction at the NFL Combine in 2016 -- admitted he doesn't have the most experience when it comes to dancing, he said he will get the job done in the show based on the popular musical and movie.