What we wouldn't give to be in the back seat!

Justin Bieber absolutely killed it with his performance at the Grammys on Sunday, but we think his carpool karaoke session with James Corden after the award show was even better! The singer and the late night host donned matching white tuxedos as they drove back to the Late Late Show studio, and they just couldn't resist getting down to Bruno Mars' "Uptown Funk."

The funniest part? When they open their swag bags from music's biggest night, only to discover that The Biebs has tons of pricey loot while the British funny man got nothing but trinkets.

In case you missed it, JB brought the house down with Skrillex to their song "Where Are U Now." Watch it below!

The Grammys have some 'splaning to do!

After a series of major musical snafus, National Academy of Recording Arts and Sciences (NARAS) president Neil Portnow explained what happened backstage at the Staples Center last night. Portnow explained what sunk Adele's performance of "All I Ask" during the live broadcast of the Grammys last night -- and it sounds like epic was fail was the fault of technical difficulties.

Portnow explained, "[The show has] over 20 performances, each performance is a complete set change," said Portnow of Adele's marred "All I Ask" performance. "We change over the microphones, wires. If you’ve been backstage, I can't tell you how we get it done, but we do. So, my understanding of what happened in that performance was, that’s a piano that gets loaded up on that center round stage. In the piano, are microphones, or a microphone, which is how that all gets taken care of. My understanding is that, just like this kind of microphone, something like that happened, the microphone dropped into the strings. You’ve seen the inside of a piano. You could actually hear it in the control room."

Yeah -- it was all sorts of not good. The big-voiced singer seemed to oversing the song as a result of the problems and the whole thing was just bad bad bad.

Portnow praised Adele for carrying on, saying, "All credit to her for the professional that she is. The show must go on. She did a great job. We certainly don’t like when those things happen, but those things happen sometimes."

Those things happened a few more times than we would have liked last night!

The crestfallen singer also tweeted about her disappointing Grammy performance, "The piano mics fell on the piano strings, that's what the guitar sound was. It made it sound out of tune. S--t happens. I'm treating myself to an in n out. So maybe it was worth it."

We gotta give it to Adele to make a joke about the night's most dissatisfying song -- she's got a great attitude. We'd be PISSED!

Meanwhile, Portnow also revealed why Rihanna dropped out of the Grammys at the last minute.

Portnow revealed, "I guess it was about 4:15 or so, we got word from her folks which basically said she had been under the care of a doctor. I guess she had been taking some antibiotics, some of you guys have had that stuff that’s going around, right? And she made the rehearsal, which was OK. She wasn’t feeling that great."

Portnow elaborated, "Doctor came in, examined her and said look, you have to be on at least 48 hours rest. You’re at risk here if you’re going to sing. Now, we all know we’ve seen this with other artists. How many other, whether it’s John Mayer who had this problem, Adele had the problem. This happens with singers. So, if you’re a singer and you have a problem like that, and the doctor says, don’t, if you’re smart, you don’t. So, we regret that. Of course we were all looking forward to that performance. She regrets it. She’d rather be singing than home in bed taking some medication. That’s what happens with live events. So we miss having her there. Hopefully next time around."

Hopefully next time they won't mess up so bad!

What we wouldn't give to be a fly on the wall of this shindig!

Justin Bieber had a huge night at the Grammys on Sunday, winning his first award and performing with Skrillex, and he feted his accomplishments with an after party at his fave spot The Nice Guy. Kourtney and Khloe Kardashian attended, and we have a feeling the eldest K sister is still doing the bone dance with The Biebs!

Hailey Baldwin was nowhere in sight, and neither were Kourt's sisters Kendall and Kylie, who are actually friends with the Canadian crooner. We still can't believe JB would be into the mother-of-three, but allegedly he has a thing for older women. One person who can't love this pairing is Scott Disick, who reportedly is trying to win back his baby mama.

We guess it wasn't too late for Justin to say sorry to Kourtney for hitting it and quitting it!

Take that, Yeezy!

Taylor Swift won the award for Album of the Year at the 2016 Grammys, and she slammed Kanye West (without actually saying his name, natch) in her acceptance speech. Taylor first thanked her collaborators and producers, and then she got into it:

“And as the first woman to win Album of the Year at the Grammys twice, I want to say to the young woman out there, there are going to be people along the way who try to undercut your success or take credit for your accomplishments or your fame. But if you just focus on the work and you don’t let those people sidetrack you, someday when you get where you’re going, you will look around and you will know it was you and the people who love you who put you there, and that will be the greatest feeling in the world."

As you know, Kanye came under MAJOR fire earlier this month when lyrics from "Famous," off his new album, The Life of Pablo, surfaced online. "I feel like me and Taylor [Swift] might still have sex / I made that bitch famous," he rapped, referencing their MTV VMAs drama from back in the day. We already knew T. Swizz was pissed, but we love that she publicly called him out for it. Someone had to!

As far as other big winners of the evening, Justin Bieber finally won his first Grammy, The Weeknd won two, Alabama Shakes won four and Kendrick Lamar, who had the most nominations with eleven, won a total of five.

Click thru for the COMPLETE list of winners!

Jordan Strauss/Invision/AP

Gorgeous girls!

On Monday some of music's biggest names gathered at the Staples Center in Los Angeles for the 58th annual Grammy Awards, and from sparkly gowns to sexy cut-out dresses, there was a wide range of styles present on the red carpet. And the hairdos? Taylor Swift certainly made her mark with an short bob, and Zendaya kinda missed it with her blonde bangs/mullet combo.

So what did the ladies wear? Kaley Cuoco rocked a silver Naeem Khan jumpsuit, Stuart Weitzman shoes, a Rauwolf clutch, and H. Stern jewelry while Carrie Underwood went with a more formal black Nicolas Jebran dress, Giuseppe Zanotti shoes, and Johnathon Arndt jewelry. Ariana Grande went with a bold, red Romona Keveza dress, Giuseppe Zanotti heels, a Jimmy Choo bag, and Ciara left little to the imagination in a Alexandre Vauthier dress. Hot!

Selena Gomez wore a sparkly Calvin Klein Collection cut-out dress and struck a pose with bestie Taylor Swift, who wore a bold midriff-baring Atelier Versace dress, but it seems like the theme of the evening was low-cut black numbers! From Bella Hadid (Alexandre Vauthier Paris) to Zendaya (DSquared2) to Demi Lovato (Norisol Ferrari), it was all about cleavage and formalwear-inspired threads.

Tell us: What was YOUR fav look of the evening?

Jordan Strauss/Invision/AP
Adele attended the 2016 Grammy Awards at the Staples Center in Los Angeles on Monday, but she didn't walk away with a single award. Huh?!

Well, it turns out Adele won't be winning any awards, because her third album, "25," which has sold 8 million units in the United States alone, was released AFTER Grammy eligibility. It will qualify for awards at the 2017 ceremony, so we have a feeling it will clean up next year!

The 27-year-old singer wore a Givenchy dress and Lorraine Schwartz jewelry, and she looked absolutely incredible when she posed for photos on the red carpet. Can't wait to watch her performance!

Jordan Strauss/Invision/AP
The Weeknd hit the Grammys red carpet with girlfriend Bella Hadid, and we're so distracted by her enviable figure, we aren't even paying attention to him -- or the fact that he's already won two major awards tonight! Bella wore an insanely low-cut Alexandre Vauthier Paris dress, and this almost has us convinced that she's hotter than her supermodel sis Gigi! After working it at New York Fashion Week, Bella flew out to LA on Sunday to be by her man's side.

The Weeknd (aka Abel Tesfaye) earned Best R&B Performance for "Earned It," which is featured on the Fifty Shades of Grey soundtrack and Best Urban Contemporary Album for "Beauty Behind The Madness." The Weeknd is up for seven nominations tonight, including Album of the Year and Record of the Year ... we're kinda rooting for him!

Jordan Strauss/Invision/AP

Justin Bieber hit the red carpet at the 2016 Grammy Awards at the Staples Center in Los Angeles on Monday, and the 21-year-old pop star was joined by a very special guest: his little brother Jaxon!

And what's even more awesome than that? Justin picked up his first Grammy EVER tonight during the pre-show ceremony for Best Dance Recording for “Where Are U Now” with Jack U. “Beliebers.. We did it! I love you. Now get ready for the show. Not done yet. #GRAMMYs,” Justin tweeted.

They’ll be performing together during the show this evening, so we'll definitely be watching!