In this week's top 10 videos that had everyone buzzing, Adam Lambert helps bring Jay Leno back to late night, a "Mini Lady Gaga" takes Brazilian TV by storm, T-Pain and Estelle both get freaky, Jay-Z teases his new concert doc, and more.

1) Adam Lambert Glams Up Jay Leno

"American Idol" rebel Adam Lambert gives Jay Leno a very glam welcome back to the "Tonight Show" by singing "Sleepwalker," a rocking new track from his "For Your Entertainment" album.

Bonus Late-Night Gig: The weird and wonderful Erykah Badu performs her chart-climbing new single "Window Seat" with the Roots on "Jimmy Kimmel Live!" (Watch)

2) "Mini Lady Gaga" Storms Brazilian TV

What's more bizarre than Lady Gaga in Muppet skirt? A "Mini Lady Gaga," going pantsless and performing a medley of her favorite pop star's hits on the Brazilian reality show "Qual é o seu talento" ("What Is Your Talent").

Bonus Little People With Big Talent: The junior members of Lil Wayne's Young Money family -- Lil Chuckee and Lil Twist --  debut the clip for their Janet Jackson-sampling, kid-friendly rap song, "Girl I Got You." Aw. (Watch)

3) T-Pain Gets Animated in "Freaknik"

T-Pain's new Adult Swim cartoon "Freaknik" debuts this Sunday, and the Auto-Tune loving singer just unveiled this teaser for the show, which ends with him cyborg-crooning, "It's fuu-un for the who-ole fa-amilyyy."

Bonus Freaky Clip: Estelle drops her long-awaited new single, "Freak," and its accompanying music video. Judging by the song's bass-pounding beat, it's safe to say that Estelle is no longer looking for an "American Boy" --  unless, of course, his name is Pauly D. (Watch)

4) Jay-Z Previews "NY-Z" Concert Doc

After taking over Madison Square Garden earlier this week, Jay-Z unveils the trailer for his upcoming concert documentary "NY-Z," featuring backstage footage and a random cameo by "sexual napalm" coiner John Mayer.

Bonus Teaser: Is this why MGMT's album art is so Sega Genesis-weird? The alt-pop group drops a video demonstrating that you can scratch off the cover of their upcoming "Congratulations" LP. The prize: A "custom metal coin." Joy. (Watch)

5) Great Art Comes Alive in "70 Million" Video

In Hold Your Horses! new video for "70 Million," the band recreates all the paintings you learned about in your art history class, from "The Last Supper" and "The Kiss," to Mondrian abstracts and Warhol's pop art portraits. Simply brilliant.

Bonus Indie Gem: Alt-rapper RJD2 has a pretty flight attendant go nuclear in the clip for his new song, "A Spaceship for Now." (Watch)

Watch More of This Week's Viral Videos:

Bruce Willis Takes Aim at Gorillaz in 'Stylo'

Ok Go's Amazing Rube Goldberg Machine

'Somos El Mundo' Video Premieres

Justin Bieber Surprises 3-Year-Old Crying Girl

John Lennon Appearance in Car Ad Stirs Controversy

Young Money Debuts Comic-Inspired 'Roger That' Video

Jennifer Lopez Does SNL 'We Are the World' Parody

Chris Brown Pursues New Love in 'Whose Girl Is That'

Last Week's Viral Videos