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With the future of the Jonas Brothers in peril ... and a big decision looming ... Joe Jonas ventured out alone today -- rollin' solo in L.A.

As we've reported ... Joe, Nick and Kevin are deeply divided musically and are expected to decide the fate of the band this weekend -- whether they'll stay together ... or go their separate ways.

24-year-old Joe -- the middle brother -- hit up SoHo House in West Hollywood this afternoon ... sans brothers.

Maybe he's trying it on for size.

Kanye West just arrived to the set of "Jimmy Kimmel Live" ... where he's all set to face off with the talk show host over a segment in which JK compared him to a child.

As we previously reported, Kanye blasted Kimmel on Twitter over the segment ... in which Jimmy mocked KW for calling himself the biggest rock star on the planet.

Kanye -- clearly offended -- tweeted, "JIMMY KIMMEL PUT YOURSELF IN MY SHOES ... OH NO THAT MEANS YOU WOULD HAVE GOTTEN TOO MUCH GOOD P**** IN YOUR LIFE..."

"YOU CAN'T PUT YOURSELF IN MY SHOES. YOUR FACE LOOKS CRAZY ... IS THAT FUNNY? ... OR IF I HAD A KID SAY IT WOULD IT BE FUNNY???"

Kimmel laughed it off ... saying, "Finally, I'm in a rap feud. I always wanted to be in a rap feud."

Unclear if the two plan on squashing the beef once and for all on the show tonight -- but Kanye didn't exactly appear smiley and jokey on his way into the studio moments ago.

Stay tuned ...

The Jenner split has become a tragicomedy ... Bruce can't seem to muster a happy face, and Kris can't help but smile.

The separated duo both showed up to a production office in L.A. today, wearing drastically different expressions -- just one day after announcing they were living apart.

Both have said they're happy with the current arrangement, but Bruce was cursing like a sailor yesterday about it ... and appears to be clinging to his wedding ring. Unlike Kris.

Still, gotta respect their work ethic.

Katie Holmes has broken out of her frumpy phase in a SERIOUS way ... strutting around the streets of NYC today looking downright sexy.

Of course, Katie has never really been unattractive, but there was a rough period ... right before she broke things off with Tom Cruise.

But after the two split in 2012, Katie began a Tiger Woods-style comeback ... in the hotness department ... going from a 9 back to a 10.

Nice work.

Bruce Jenner's new favorite word is clearly F**K, because he couldn't stop using it yesterday after Kris Jenner announced their separation.

Bruce was at a golf course Tuesday near the family's home in Calabasas ... and he flew off the handle at some photogs (not TMZ) who he claimed were on private property.

Fast forward to later Tuesday ... at a yogurt shop with Kendall and Kylie in the San Fernando Valley ... more F**Ks and fingers.

Lamar Odom and Khloe Kardashian finally came back together in public -- for the first time in months -- and all it took for them to reunite was Kris Jenner getting separated.

Khloe and Lamar were photographed driving together -- she had the wheel, he rode shotgun -- near her mom's home in Calabasas ... right around the time news broke about Kris and Bruce Jenner's split on Tuesday.

Nothing too warm and fuzzy about the look on their faces in the SUV ... but it is the first time KK and LO did anything together -- besides discussing his drug addiction -- since early summer.

Despite the fact they appear to be rallying for Kris ... our sources say Khloe and Lamar's marriage is still much closer to being over than reconciled.

Lindsay Lohan and her mom Dina grabbed their running shoes ... their track suits ... and a couple of bottles of Coca-cola as they hit the streets of New York today.

Yeah, Coke isn't the drink of choice when you're working out, but it beats vodka.

Lilo and DiLo rented bikes and cruised the West Side Highway in NYC ... then ditched the bikes and worked up a sweat during a quick run -- sodas in hand -- before hopping into a waiting SUV.

Feel the burn.

The very day Jermaine Jackson became the owner of a $160,000, 2009 Ferrari California ... he had his wages garnished because he was behind on his child support ... TMZ has learned.

According to official documents ... Jermaine's baby mama, Alejandra Jackson, obtained an order which allowed the government to withhold $3,750 from his wages.

Alejandra -- who has had recurring problems getting child support from Jermaine -- got the order after he fell behind. The breakdown of the $3,750 -- $3,000 for monthly support, and $750 for past due.

The garnishment order allows the government to garnish future wages as well to cover the $3,000 a month.

As we first reported ... Katherine Jackson is pissed off at Jermaine for dropping $70k in cash (he traded in his Rolls-Royce for $90k) when he couldn't pay his bills.

Here's Victoria's Secret supermodel Alessandra Ambrosio taking a bite out of an actual piece of edible pizza in L.A. yesterday ... and carefully contemplating whether or not to spit it out.

It's not the first time Alessandra cheated on her supermodel diet -- earlier this year, she was spotted chewing on a breadstick in an L.A. supermarket.

Also, in 2012, she was photographed taking a bite of chocolate cake ... and was spotted with an ice cream cone in 2009.

Glutton.

Days after being officially renamed to the USA national team, soccer goddesses Alex Morgan and Sydney Leroux celebrated by hitting the beaches in Hawaii this weekend ... in very tiny bikinis.

The Women's World Cup tournament is still 2 years away, but qualifiers begin in Fall 2014 ... and the team is scheduled to take on Australia and New Zealand in some friendly matches later this month.

Enjoy the free time while ya got it.

Charlie Sheen chose his current favorite ex-wife for a trip to show the kiddies how much fun it can be to stab a pumpkin in the face.

Denise Richards and Charlie took the twins he had with Brooke Mueller ... along with Denise's adopted daughter Eloise (yeah, it's complicated) to Underwood Farms in Moorpark.

Denise is the temporary legal guardian of twins Bob and Max while their biological mother Brooke tries to get clean.

Holy crap ... Ke$ha just posted some racy new lingerie pics ... and she looks INCREDIBLE!!!

Butt ... did the pop star really tone up her body -- or are the new pics the result of some creative camera work?

Here's the deal -- Ke$ha posted the pics on her Instagram page yesterday, which feature the singer showing off her G-string'd ass in various sexual poses.

In the pics, Kesh looks WAYYYY different than she did strolling the beach back in 2011 (see below).

Pam Anderson ain't exactly shy about public nudity ... so when the opportunity came up for the 46-year-old to go top down at a topless beach in France ... out came the gals.

Pam was with her BF Rick Salomon -- and the two were spotted romping around the beaches in Biarritz, France yesterday like two topless teenagers.

Fun Fact -- Biarritz is the birthplace of famed chemist Ernest Fourneau -- who played a key role in the development of chemotherapy as a way to combat cancer.

... and now you know.

Lamar Odom just showed up at the home he once shared with Khloe Kardashian, looking shockingly thin and haggard.

Lamar hasn't been seen for days ... but these are the first photos that show the dramatic weight loss and toll that drugs have taken on his body.

It appears he went to the Tarzana house to visit Khloe. Our sources say she had drawn a clear line in the sand -- get help or stay away.

Kim Kardashian is determined to move all of her baby weight back into her ass cheeks ... and by the looks of things, she's doing one helluva job.

KK hit the streets in Paris this week ... en route to a workout session at a local gym.

So, we gotta ask ...

BTW ... Kim's discovered one of the side effects of breast-feeding -- engorged boobs. Check out the video below ...