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'Saturday Night Live's 50th Anniversary after-party at the Plaza Hotel in NYC was a huge extravaganza, with some of the biggest celebs on the planet showing up -- including Kim Kardashian, Lady Gaga and Dave Chappelle.

TMZ obtained photos and videos of all the fun, laughter and performances by dozens of celebrities who packed into the ballroom and other parts of the legendary hotel in Midtown Manhattan Sunday night.

Many were photographed in their fancy outfits walking into the event. Of course, Kim K made a huge splash in her silver gown and Gaga looked pretty goth-glam in her get-up.

A huge congrats to one "Love Is Blind" Season 8 couple ... because they made it all the way down the aisle and tied the knot!

SPOILERS ahead!

Here comes the big reveal (translation: last chance to look away) ...

R. Kelly's attorney is clapping back at 'SNL' after the show took a jab at him during its 50th anniversary special this weekend.

Kelly's lawyer, Jennifer Bonjean, tells TMZ she finds it "Rather arrogant that SNL sees it as their job to decide, belatedly, who should and should not be canceled."

In case you missed it, 'SNL50' made light of its more controversial moments over the years with an "In Memoriam" segment, highlighting its "problematic guests" -- including R. Kelly, Diddy, O.J. Simpson, Jared Fogle and Robert Blake.

O.J. Simpson was the butt of a John Mulaney joke during the "Saturday Night Live" 50th Anniversary show ... and it got a laugh from the guy overseeing his estate.

The Juice's longtime attorney and current executor of his estate, Malcolm LaVergne, tells TMZ ... Steve Martin's monologue with John Mulaney was great, and John's joke about accused murderers hosting the show was very funny.

In the opening Mulaney observed, "894 people have hosted 'Saturday Night Live,' and it amazes me that only two of them have committed murder."

Candice Bergen lost her husband this weekend ... Marshall Rose died Saturday ... TMZ has learned.

We're told Rose died at home in New York from complications with Parkinson's disease. He was surrounded by family. Rose is survived by his famous wife Candice, as well as three children and six grandchildren.

Tom Hanks stirred the pot as he stepped into character for 'SNL's 50th anniversary special -- but his portrayal of a Trump supporter didn’t land well across the board.

The Oscar winner took on the MAGA-hat-wearing role of Doug in a 'Black Jeopardy' skit, where his character preached the world would be better if more people went to church.

When game show host Darnell Hayes -- Kenan Thompson -- went in for a handshake, Doug pulled back, saying, "Don’t like that, whoa, whoa, whoa!"

Arnold Schwarzenegger bared it all in "Terminator" 40 years ago ... and now his son, Patrick Schwarzenegger, is keeping the family tradition alive -- going full frontal in "The White Lotus."

The HBO show's season 3 kicked off Sunday night, and Patrick's character, Saxon Ratliff, wasted no time -- he checked into the luxe Thai resort with his family, and then promptly checked out of his clothes in a full-on NSFW scene.

After striking out with the ladies at the resort, Saxon decided to handle business himself in the scene. He hopped out of bed, butt-naked, strolled to the bathroom, and just when you thought that was it … BAM! The camera swung around, and yep, everything was on display!

Ryan Reynolds made a laughing matter out of his and Blake Lively's nasty legal battle with Justin Baldoni at 'SNL 50' Sunday night ... appearing briefly in a bit as Tina Fey and Amy Poehler surveyed the crowd for celebrity guests.

Check out the clip ... the "Saturday Night Live" icons ask him ... "How’s it going?" to which he quips ... "Great! Why, what have you heard?"

Fans can see Blake was all smiles as her hubby got some camera time ... though she looked like she saw a ghost when he asked his rhetorical question.

Kim Kardashian's famous backside made an early appearance on the 50th anniversary special for "Saturday Night Live" ... with Kristen Wiig pretending to smack on her behind like bongos.

In the first sketch after the monologue on 'SNL50,' Kardashian appeared as one of the Maharelle Sisters -- the singing quartet with three gorgeous sisters and then Dooneese, a character played by Wiig with a huge forehead, tiny hands and a nasally singing voice.

In this particular version, Will Ferrell -- playing Robert Goulet -- is on "The Lawrence Welk Show" trying to find choose between three women Ana Gasteyer, Scarlett Johansson and Kardashian ... but, Dooneese keeps getting in the way.

Aubrey Plaza made her first appearance back in public since the tragic passing of her husband who died by suicide earlier this year.

Aubrey introduced Miley Cyrus and Brittany Howard's musical act during the "Saturday Night Live" 50th anniversary special on Sunday night. It's the first time the public has seen Aubrey since her husband, Jeff Baena died by suicide at the beginning of January.

Days after Jeff's death, Aubrey was scheduled to present at the Golden Globe but understandably did not attend.

"Saturday Night Live" has been on 50 years ... and, some of the biggest stars in Hollywood gathered to celebrate the brilliant sketch comedy show -- bringing their best style to the carpet.

Cast members Maya Rudolph and Kristen Wiig brought some spice to the carpet ... with Maya showing off her bright blue dress and Kristen throwing on a revealing, sheer black ensemble. Blake Lively, who hosted the show back in 2009 wore a low-cut silver dress to the event.

The guys brought their A-game too ... with Tracy Morgan and Darrell Hammond stunning in their suits.

5:00 PM PT -- Blake and Ryan kept their fun weekend going on Sunday ... stopping by "SNL 50" to show love for the sketch comedy show they've both previously hosted.

Blake Lively and Ryan Reynolds might be in the middle of some legal drama, but they're still finding time to celebrate ... showing up to Chris Rock's birthday party and taking a pic with a controversial comic actor.

American actor and comedian John Gemberling was 33 years old when he first started playing Matt Bevers AKA "Bevers" -- the messy but lovable gamer -- on Comedy Central's sitcom "Broad City" back in 2014.

Joining Gemberling in The Big Apple included Abbi Jacobson as the gym janitor striving to be a trainer, Abbi, Ilana Glazer as Abbi's chill and wacky bestie who loves to smoke, Llana, and Hannibal Buress as the dentist and Ilana's hookup buddy, Lincoln.

John's other notable sitcoms include playing Gil on NBC's "Marry Me" and John on Fox's "Making History."

Mauricio Umansky's going to have some trouble going through metal detectors for the foreseeable future ... 'cause he's got a new metal casing in his clavicle after his recent nasty skiing accident.

The reality television star posted about his condition Sunday afternoon ... writing a message on Instagram to his fans to tell them he's recovering after his nasty crash.

Umansky says his clavicle was a clean break ... but, it still required surgery -- and he now has a metal plate and 12 screws in the bone.

Brooks Nader's newest photoshoot is probably more appropriate for Playboy than Sports Illustrated's Swimsuit issue ... 'cause she ditched the bikini for an au naturale look on vacay.

The model ran off to Los Cabos, Mexico for a little Valentine's vacation ... and, she decided to really let loose -- throwing off her top and letting it all hang out.

Check out the pics ... Brooks starts with a bright orange top on while her topless gal pal photographs her -- but, she quickly decides to get as naked as her proverbial dancing partner and frees the nipple for the whole beach to see.

Will Ferrell's looks over the years make him one sexy spartan!

Here is a 30-year-old version of the "Saturday Night Live" star rockin' the bowl cut and side burns for his iconic sketch turned movie "A Night At The Roxbury" back in 1998 (left).

And, nearly three decades later Mr. Ferrell was cool and casual at last month's screening of "You're Cordially Invited" in NYC (right). He may be showin' some gray, but in our eyes, he can still get it all night and all day 😜!

With show-stopping impersonations of stars like Alex Trebek, Harry Carey, George Bush  ... the only thing his rugged beauty could use is a little more cowbell!

The question here is ...