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Even 9 lives can't withstand 20 degrees below zero -- which is why Chicagoans are on a mission to save hundreds of thousands of stray cats ... with the help of tons of straw.

A grassroots community in Chi-Town called "Chicago Community Cats" has been bracing for a week for the polar vortex temperatures by prepping makeshift shelters for stray and feral cats. Erica Roewade, who runs the group, says about 200 people have been working around the clock to build straw-stuffed bins to keep the kitties warm.

It's a huge undertaking. Chi-Town reportedly has roughly 200k feral cats roaming its streets and alleys.

Roewade says the group has also purchased about 100 "Snuggle Safe Disks" (which also keep pets warm), heated water bowls and other supplies to distribute throughout the city.

Considering temps are expected to stay in the negative all week -- Roewade says the most important thing is to keep the frigid wind and airflow off the kitties.

Doesn't seem Tom Brady's got too many nerves heading into his NINTH Super Bowl ... 'cause the G.O.A.T. was nothing but smiles at Patriots practice Wednesday!!!

New England hit the field at Georgia Tech for the first time since landing in Atlanta earlier this week ... and Tom was as cool as ever during the workout.

In fact ... the 41-year-old seemed downright giddy -- laughing and smiling throughout the practice.

Begs the question ... what is he so thrilled about just a few days before yet another pivotal game in his 19-year career??

Perhaps it's that Rob Gronkowski was healthy and on the field practicing ... or maybe he's just that confident about a victory over the Rams????

The 25th SAG Awards is in full swing, and if you take a peek behind the scenes ... you'll see everyone was dressed to the nines and beyond for this thing.

Tons of actors were on hand Sunday for the award show honoring folks in the SAG-AFTRA union, and nobody skimped on the swank -- including Michael B. Jordan (who wore a colorful Louis Vuitton harness over his tux), Lady Gaga who dazzled in a white gown, Viggo Mortensen who killed it with maroon ... and lots and lots of other stars who brought out their best outfits.

Some other standouts ... Chris Pine in the classic all-white tux, Sandra Oh who donned a gorgeous red gown, Darren Criss who sizzled in silver and, frankly, the entire "Black Panther" cast ... who looked absolutely incredible together in the front row.

Mark Consuelos has mastered the double life ... living it up on vacay with his wife AND mistress.

The "Riverdale" star is down in Mexico with his wife, Kelly Ripa, who will costar alongside him later this week on the hit CW show when she plays his TV mistress, Mrs. Mulwray. It's a role Kelly said she's excited about because it was "23 years of auditioning for a role I was born to play."

Know what other roles they were born to play? Making all of us jelly of their ridiculously hard bods ... in matching white swimwear, no less.

Lil' Kim's legacy is alive and well, even during a funeral ... just check out "Love & Hip Hop" star Dream Doll's living tribute to her hip-hop idol.

The 'L&HHNY' MC recently did a photo shoot recreating many of Kim's iconic looks as part of a music video she's doing for her new track, "Funeral," which features Lil' Kim.

Check out the pics -- they're a dead-on impression of some of Kim's most stunning shoots and visuals, including her blue outfit and wig for the "Crush On You" music vid, Kim's "Got D***" campaign from '03, her "How Many Licks" album cover, her 1999 Interview Magazine Louis Vuitton cover shoot, and more. Lucky for DD, there was no shortage of inspiration.

Dream Doll's manager KD McNair tell us production for the photo shoot and the music video -- which is still in the works -- ran her team upwards of $10,000 and took 12 hours to complete. We're told DD looks up to Kim and wanted to pay homage to her in this project.

It's now time to reevaluate who your Valentine is this year ... because UFC star Arianny Celeste is doing a super hot lingerie shoot for Lovers Day ... and she doesn't know you exist.

Celeste and her best pal Alejandra Boggiano dropped new smokin' hot images of their Valentine's Day shoot for their company Girlfriend Box ... and TMZ Sports has them.

The company offers a service to guys who want to get their GFs sexy outfits, by offering them a subscription program.

Good idea ... and a better way to sell the idea is Arianny serving up a variety of scantily clad looks to promote the company, and we gotta say ... DAMN.

BTW -- GF Box subscriptions range from 69-89 bucks ... and in case you were wondering, Arianny DOES NOT come with your first month, but you do get a Valentine's Day card, an outfit and jewelry for your girl.

Don't let these two almost identical images of Gwen Stefani give you the boot, stand your ground and scan these snaps to see if you can find the differences between these two super similar shots!

The winter weather's got nothing on the hotties in Hollywood .. scroll through our gallery of stars in sweatpants and see if you can guess the babes keepin' it cozy and casual.

Crystal Harris just unloaded the home Hugh Hefner left her for $5 million.

Hefner bought the 4 bedroom pad in the Hollywood Hills back in 2013. The backstory is interesting. Hef married Crystal in 2012, and the next year he wanted to make sure she had a roof over her head when he died. You'd think the Playboy Mansion would have been enough, but the fact is Hef didn't own it ... it was owned by Playboy Enterprises, and he was worried it might be sold and his wife would be displaced.

So, in 2013, he bought the house which was held in trust for the 2 of them. When he died in September 2017, she became the sole owner.

As for how much the house appreciated in value ... it didn't. Crystal listed it for $7.2 mil, but it didn't sell. She just sealed the deal on the 5,900 square foot home for $5 mil -- the price for which it was purchased.

L.A. realtors Jason Oppenheim and Christine Quinn represented the buyer.