Paparazzi Photo

Attention Bayside High alumni: Zack Morris is jacked!

Zack -- aka Mark-Paul Gosselaar -- showed off his lean, smooth and ripped 39-year-old pecs, bis and abs, while filming a surfing scene with his "Franklin & Bash" co-star Breckin Meyer and Eric Balfour in Malibu on Tuesday.

These days he's saved by the dumbbell.

With all the rumors swirling that he and Miley Cyrus have broken off their engagement, Liam Hemsworth fled to his native Australia to be with the only woman that can ever really understand him ... his mom.

With Miley back in the states, the 23-year-old "Hunger Games" star showed off his ripped guns while out shopping with mommy on Wednesday.

Speculation about the demise of their relationship has been rampant ever since Liam was spotted in the back of a car with actress January Jones and further fueled when Miley was spotted without her engagement ring last week.

Another theory is that Miley was just too crazy for him and he broke it off.

While no official word from either of their camps, Liam knows there's nothing like a mother's love.

Miranda Kerr suffered injuries to her neck and back during a car wreck in L.A. on Monday ... this according to the model's rep.

Kerr was sporting a neck brace -- which she tried to cover with a scarf -- as she walked around L.A. Tuesday night ... after someone reportedly smashed into her car on an L.A. freeway.

Kerr's rep told Australia's 9 News, "She is in a lot of pain, but really we are just glad it was not more serious."

Neither Kerr's son Flynn nor her husband Orlando Bloom were in the car at the time of the crash -- but the rep says, "[Orlando is] taking very good care of her. He’s an amazing husband."

There are reports the other driver involved in the wreck was arrested for DUI -- but so far, we are unable to confirm those reports.

Story developing ...

Rob Kardashian learned an interesting lesson yesterday ... when you go black, sometimes you have to come back ... because he was reportedly nailed for driving with tinted windows.

The Bev Hills cop was unsympathetic to Rob's quest for vehicular anonymity and served up a citation.

Big sis Kim was luckier Monday. A cop gave her a warning to lighten it up ... then sent her on her merry way.

Kim always seems to get off.

No, that's not a down-on-their-luck homeless Olsen twin begging for change, it's just Ke$ha sprawled out on the sidewalk and drinking a can of beer out of a bag, silly.

As she threw back a cold one on the ground, the 26-year-old "Die Young" singer did her best to blend in with all the other hipster vagabonds tooling around Venice Beach on Tuesday.

Justin Bieber may not have enough fans in Portugal, but he still has some ... and they all turned out to say hi as he arrived in Lisbon Monday.

As we previously reported ... Bieber cancelled one of two planned concerts because of lackluster ticket sales.

Bieber is bragging that he's sold out the second concert. We're assuming that's because people from the cancelled concert are going to the remaining one.

In fairness ... the unemployment rate in Portugal is 17% and ticket prices range from $52 to $470.

The ultimate A-list power dinner went down in Berlin this weekend, when Matt Damon, John Goodman, George Clooney -- accompanied by his mustache -- and Bill Murray joined forces to break bread schnitzel together.

They're all in Germany shooting their new flick "The Monuments Men," so we gotta ask:

Kim Kardashian likes her windows like she likes her men ... the darker the better ... but moments ago, her tinted windows got her in trouble with the cops ... TMZ has learned.

KK was pulled over in Calabasas earlier today while on her way to the Kardashian family compound.

But this story has a happy ending for Kim -- we're told the cops only gave her a warning ... NO TICKET.

Kanye West had similar luck in January, when cops pulled over Kanye for speeding and tinted windows ... but let him go with a warning.

Valerie Harper was in a great mood over the weekend, looking great and laughing it up as she talked to Savannah Guthrie about her terminal illness.

Harper was on "Today" ... discussing her brain cancer prognosis and the prospect that she may only have 3 months to live. A very wise Harper said, "If you die, you're not a failure. You're just somebody who had cancer, and that's the outcome."

San Francisco 49ers QB Colin Kaepernick may not have a Super Bowl ring, but he still managed to get one perk ... courtside seats at the Clippers game on Sunday.

The 25-year-old brought along a few of his burly pals to watch the Clippers destroy the Detroit Pistons, 129 -97.

Justin Bieber can't trust Lil Twist with one of his REALLY, REALLY expensive cars anymore, so Twist has been reduced to driving around in only one of Justin's REALLY expensive cars.

Twist, who crashed Bieber's Fisker Karma on Tuesday, was spotted out in Calabasas yesterday ... this time riding around in Bieber's Range Rover.

TGIF bitches ... here's a pic of Victoria's Secret Angel Doutzen Kroes basically getting completely naked in sunny St. Barts today. Absolutely nowhere near you.

It was a bathing suit besties battle as Cameron Diaz and new moms Drew Barrymore and Reese Witherspoon soaked their movie star bones while on vacation together in Mexico the other day.

Question is ..