“I walk into the store. I act totally like a regular person and then I bust out and start dancing,” Trevor says. “That’s just like the best part because I walk in the store totally mellow.”

Trevor is a big pop music fan and has so far recorded himself dancing to Lady Gaga, Justin Bieber and Britney Spears. He records himself dancing freestyle on the store’s computers and uploads directly to YouTube. According to CNN, this is happening all over the country, so no one is safe.

Have you witnessed this in your friendly neighborhood Apple store? What did you think? Funny or did Trevor (or one of his friends in dancing) step on your toes? Tell us in the comments.

E Street Band saxophonist Clarence “The Big Man” Clemons is said to be in “responsive and stable condition” after suffering a stroke earlier this week. Now, one of his most recent collaborators, Lady Gaga, has posted a 13-minute compilation of well wishes to her official YouTube channel.

Gaga has been tweeting her love for the acclaimed musician since news of his health problems first surfaced. On Monday, she asked her legion of fans to “make some get well videos” for Clemons, who she calls “my very close friend.”

Later that same day, she tweeted, “In bed with Mommy thinking about Clarence, I can't wait for you to see the beautiful video we made together. He's a really special person.”

Clemons lent his talents to two tracks – “Hair” and the current Billboard top 10 hit “Edge of Glory” – on Gaga’s mega-selling album Born This Way. Of working with Gaga, Clemons told Rolling Stone, "It was a day I'll never forget. When I left the studio, it took me a few days to come down. What she does, man, it just blows my mind.”

It seems she feels the same way.

Check the video out below.

By Meg Jones

Seventeen-year-old YouTube sensation Christina Grimmie was in the MTV newsroom Monday and had everyone remembering MTV Iggy's look at the Top 10 People Most Likely To Become The Next Justin Bieber.

Since we listed her a year ago, she has quadrupled the number of subscribers on her YouTube channel, zeldaxlove64, to over 920,000 people, and her career is taking off with the release of her debut EP Find Me, which was released yesterday.

She’ll also be hitting the road this summer opening for Selena Gomez. The punk-rock pianist and singer told MTV News about how she was discovered on YouTube by Gomez's parents (talk about a Bieber connection!).

So now that Grimmie has made it big on YouTube, who else can we add to the list of Bieber wannabes?

Eight-year-old rapper MattyB, dubbed “mini-Bieber,” has achieved YouTube fame with his covers of hit songs by artists like Lady Gaga to Michael Jackson. He just released his latest song, a cover of Eminem and Royce da 5'9" "Lighters" (feat. Bruno Mars), in collaboration with Jason Chen and Marshall Manning, two more young artists showcasing their talents on the Internet.

Who is your pick to become the next big thing from YouTube? Tell us in the comments below!

There's been a strong tradition of indie artists from Sweden — including Peter Bjorn and John, I'm From Barcelona and the Hives — but none sounds like Lykke Li, a 22-year-old singer/songwriter whose music has recently blown up on the Internet.

With a combined total of 2 million hits on YouTube, her minimalist pop videos are resonating with the online audience, and Li is aiming to translate that success into record sales with her debut album, Youth Novels. Kurt Loder is a big fan, and you can check out his profile of Li here.

After our interview with the Swedish sensation, she graced us with an intimate performance of her latest single, "I'm Good, I'm Gone." Check out the full song right here.

How do you think these teen queens should settle their beef? A sing-and-dance-off? A summer reading challenge?

Who "grows up" better: PCD or BCD?

When we got a call from our favorite YouTube sensation Britney Houston, letting us know that she was going to be shooting her own video for the Pussycat Dolls' "When I Grow Up" right here in NYC, we couldn't pass up the opportunity to see her in action. Check out the “making of” the new “When I Grow Up” parody right here. Then watch the finished product and let us know who does it better, PCD or BCD?

In theory, it's a series of videos designed to promote both PR's upcoming 80's Babies album and their newest member, a beefy crooner named — you guessed it — 4Play (guess what he's all about?!?). And while the clips are many things (hilarious, terrifying, jaw-dropping), they're also educational.

And as proof, I've compiled this list, which the powers that be have dubbed "Five Things I Learned From Pretty Ricky's '21 Days of 4Play' Video Series":

1) Being in Pretty Ricky is tougher than it looks ... Not only must you be "in mint condition, physically," but you should also be "spontaneous and full of vigor," "a beast in the bedroom," "very, very intelligent" and "sexual." It probably wouldn't hurt to "always have your grown man on" either.

2) ... But not as tough as you might think. The group's newest member, 4Play, is apparently "the number-one singer in the world," and he can do 20,000 curls in the gym, neither of which seem to hide two rather glaring things: A) He has the charisma of a lint roller (seriously, his biggest contribution to the group seems to be his ability to comb his hair and speak at the same time); and B) As one YouTube commenter puts it: "He can sing — he ugly tho."

3) Pretty Ricky are committed to their art. The majority of their new album was recorded "butt-ass f---ing nekkid," because, as group member Diamond Blue explains, "When y'all hear that riff, I want y'all to say, 'I wonder if he was nekkid when he did that?' And you know what you gonna say then? 'Yeah.' " I am not sure whether this is the most amazing or the most homoerotic thing I've ever heard, but it's definitely the least sanitary.

4) Pretty Ricky are intelligent. For example, during an SUV trip, they explain that the difference between the suffixes "-tion" and "-tioning" is that "-tion" is a noun, and "-tioning" is a verb. Or, as Blue puts it: "If we get a nice young lady, or a '-tion,' [and] by the end of the night we end up '-tioning,' that actually means that we ended up having intercourse, penetration, oral sex, kissing, hugging — whatever you want to call it — that's '-tioning.' "

5) Pretty Ricky are insane. They live in a mansion that appears to have been decorated by either a South Beach retiree (potted plants, glass coffee tables, black leather furniture, animal-print pillows, inexplicable jungle motif throughout) or the ghost of King Tut (just watch Day 17). They play craps shirtless. They love girls "with one toe, five toes or 10 toes." They wear matching Versace silks. They say things like, "[For] the first album, Blue Stars, you needed a tissue. Second album, Late Night Special, you needed a rag. This album ... you need a towel for all those tears." There is not a hint of irony in anything they do, not even Diamond Blue's brand-new '80's-themed flat-top-and-dookie-chain look. This is probably because no one in Pretty Ricky can spell the word "irony."

The story began two months ago when Adam Sevani (Moose from "Step Up 2: The Streets") and Jon Chu (the movie's director) challenged Miley to "the biggest online dance battle in YouTube history." Miley and her friend Mandy responded with a counterstrike set to Madonna's "Four Minutes," but Chu's retaliation involved celebs including Adam Sandler, Brittany Snow, Diana Ross, Chris Brown and Lindsay Lohan.

Given M&M's far less star-studded video, it had to be over, right?

Well, yesterday — two months from the day it started — Milez and Manderz released another video, one that features appearances by Joey Fatone, Carson Daly, Ryan Seacrest, Michael and Julian Rapaport, Channing Tatum (in Prague!), Chris Kattan and Pedro from "Napoleon Dynamite," not to mention a totally creepy magic trick by David Blaine.

In the words of crackerjack cameraman Brendan Kennedy (who tipped us off to the battle): "I LOVE IT. Oh, and it kept my attention-deficit-ridden brain for all 9:59 of it."

And it's still not over! Watch the latest vid to find out how the crews are going to settle this beef once and for all.

Who do you think will win? AC/DC have some crazy moves, but M&M have, well, Miley.