He's pranked Madonna, Will Smith and Adele ... but his next victim could be his cell-mate Bubba.

Vitalii Sediuk faces jail time for crashing the Grammy Awards stage and messing with Adele's moment at the February ceremony ... TMZ has learned.

The 24-year-old Ukranian ran onstage ahead of the singer's acceptance speech and spoke into the microphone before Jennifer Lopez shooed him off. He's been charged with entering a performance area and interfering with performers ... both misdemeanors ... and faces six months in jail and a $1,000 fine for each count.

He'll be arraigned May 31.

Remember -- this is the guy who tried to kiss Will Smith on a red carpet in Moscow ... and got slapped down for it. His first trick was to hand Madonna a bouquet of hydrangeas -- knowing full well that they are the Material Girl's "most loathed" flower.

Wonder if he has any pranks involving soap on a rope.

If he could go back in time, singer Miguel STILL wouldn't give Frank Ocean a standing ovation for beating him at the Grammys ... telling TMZ, it's just his competitive nature.

You'll recall, Miguel lost to Frank for Best Urban Contemporary Album at the Grammy Awards this year ... and while everyone stood to clap for Frank, Miguel remained seated. Chris Brown also lost to Frank, and remained seated as well.



Miguel was out in L.A. yesterday when we asked if he had any lingering feelings of guilt for dissing Frank ... and let's just say, he wasn't feeling too apologetic.

Nevertheless, Miguel did offer Frank his belated congratulations ... kinda.

Justin Bieber isn't taking too kindly to being told he doesn't deserve a Grammy -- going after the Black Keys drummer who insulted him ... saying, the drummer "should be slapped around."

Bieber added "haha" at the end of his statement -- which he posted on Twitter -- like he was joking.

the black keys drummer should be slapped around haha

— Justin Bieber (@justinbieber) February 12, 2013

TMZ broke the story ... BK drummer Patrick Carney mocked Bieber's Grammy snub after the awards on Sunday -- telling TMZ, "He's rich, right? ... Grammys are for music, not for money ... and he's making a lot of money."

Grammy count -- Black Keys 7 ... Bieber 0

The moron who crashed the stage at The Grammys -- only to get kicked off stage by Jennifer Lopez on live TV -- was arrested for trespassing directly following the awards show ... and it's not the dumbest stunt he's ever pulled.

The idiot who wound up in handcuffs is Vitalii Sediuk ... the same dumbass who got slapped in the face by Will Smith last year (and rightfully so) when he tried to surprise the actor with a kiss on the lips on a red carpet.



During the Grammys, Sediuk somehow weaseled his way backstage ... and when Adele was announced as the winner for Best Pop Solo Performance ... Vitalii rushed to the podium and tried to grab the mic from presenter Jennifer Lopez.

Sediuk managed to get out a few words ... saying, "Thank you, Adele. You’re my inspiration” ... but Lopez quickly ripped the mic back and shooed him offstage.

Directly following the show, cops arrested Sediuk for trespassing -- and he spent the night in a jail cell ... this according to the Hollywood Reporter.

Sediuk told THR he's just a prankster and meant no harm -- adding, "I’m not a crazy guy. I just think differently."

Sure.

Chris Brown had another Grammy weekend filled with drama -- but at least no one was arrested this time ... or beaten. Baby steps.

Check out TMZ on TV -- click here to see your local listings!

Katy Perry's giant TA-TA's ... Alicia Keys' underboobs ... Kelly Rowland's twins ... turns out they were all given the stamp of approval from CBS -- despite the network's previously harsh warning to keep the nakedness to a minimum.

Despite these revealing outfits -- and several more -- a rep for CBS tells TMZ, "All wardrobe selections passed our standards, if only barely."

You'll remember … CBS issued a memo urging everyone in attendance to cover up or else -- saying in part: "Please be sure that buttocks and female breasts are adequately covered. Thong type costumes are problematic. Please avoid exposing bare fleshy under curves of the buttocks and buttock crack."

If this is the music biz covering up ... count us in!

Rihanna and Chris Brown's new romance has already gone to pot -- the couple celebrated CB's zero Grammy wins by hitting up a Hollywood nightclub last night ... and lighting up what appears to be a joint.

Chris and Rihanna -- who won her 7th Gram last night for her "We Found Love" music video -- dropped by Supperclub for a private party ... and according to sources inside the venue, the whole place was filled with pot smoke.


It's the first time the couple's been together on Grammy day since 2009 ... and we all know what happened then.

And there's this -- Chris was shot driving away from the club with Rihanna in the passenger seat at around 3:20 AM ... which would be a big issue if he's driving under the influence of pot -- a big issue because he's on probation for beating his passenger to a pulp. 

Justin Bieber has no business winning Grammys -- at least according to a guy who cleaned up at the award show last night ... Patrick Carney from The Black Keys.

Patrick was swarmed by fans outside Chateau Marmont when we asked if Bieber should feel snubbed -- seeing as how he didn't get a single Grammy nomination this year -- and he simply said, "He's rich, right?"

Then the Keys' drummer threw a major jab, adding ... "Grammys are for like music, not for money ... and he's making a lot of money. He should be happy."

He might have a point -- Justin's never won a Grammy, and does seem pretty happy ... with his Ferraris, Lamborghinis, and such.

The Black Keys took home 4 Grammys last night -- and probably aren't hurting in the money department either.

By the way, you gotta hear what Patrick has planned for his riches.

Chris Brown handled his Grammy defeat to Frank Ocean last night with dignity and class ... KIDDING!!! ... he was totally disrespectful.

Ocean edged out Brown and Miguel to capture the award for Best Urban Contemporary Album. While most people stood and applauded Ocean ... Brown stayed in his seat -- which just happened to be front row and center, in clear view of the cameras.

It's worth noting ... Miguel didn't stand to congratulate Ocean either.

Must be something in the water.

Chris Brown and Rihanna got nice and close during Sunday night's Grammy Awards.

True love. Soak it in.

The 55th Annual Grammy Awards are in full swing and there are sure to be some serious fashion fiascoes ... regardless of what CBS says. Check out all the photos for all the good, the bad and the ugly!