Pop superstar Jason Derulo kicks off this week's Hot 5 with his brand new single 'In My Head'! Watch it along with the rest of the most watched videos of the week including music from Adam Lambert, Rihanna, Wyclef Jean, and Kid Cudi.

Just in time for the Oscar nominations, former winners Three 6 Mafia drop a brand new music video in this week's Sucker Free (with help from Sean Kinston and Flo Rida)! Watch 'Feel It,' along with music videos from 50 Cent, Usher, and more.

Wyclef Jean follows up his 'Hope For Haiti' benefit with his new music video single 'Hold On.' Check it out along with music videos from Cold War Kids, Street Sweeper Social Club, Usher, Jay Sean, Hot Chip, and more.

If you're unsure who should be your new favourite band, MTV can help! MTV Push is bringing you one of the hottest new acts of the year: Jason Derulo. Watch live performances, interviews, and music videos from the R&B hot shot now!

MTV Drops presents four live performance tracks from fast rising pop star Ke$ha! Check it including her hit single 'Tik Tok,' 'D.I.N.O.S.A.U.R.,' and more.

Rihanna kicks off this week's MTV Big 10 with her latest hit music video single 'Hard'! Watch it now along with music videos from Jay-Z, Lil Wayne, Kid Cudi, Phoenix, Ludacris, Jason Derulo, and more.

Taking Dawn kicks off this week's Headbangers Ball by cranking up their amps up to 11 in their latest music video 'Time to Burn'! Watch it along with music videos from Janus, Blessthefall, Slipknot, Mudvayne, and more.

Noah & the Whale kick off a fresh new edition of Subterranean with their new music video 'Love of an Orchestra.' Watch it now along with new music videos from Editors, Felt, Vandaveer, Nneka, and more.

MTV Drops presents four preview tracks from Heidi Montag's new album 'Superficial,' featuring her latest single 'Black Out.' Pick it up online and in-stores now!

Today on MTV Live, Canadian pop-punk rappers Down With Webster bring their musical stylings to the Temple to perform three exclusive live performances for the MTV Live crowd, including their hit single 'Rich Girl$.' Watch it now!

Ivy-League indie rockers Vampire Weekend refine all the energy, wit and charm of their songs for this pitch-perfect 'MTV Unplugged' performance, including their hits 'A-Punk,' 'Cousins,' 'Oxford Comma,' and more!

We're kicking off the New Year by counting down the 100 most watched videos of 2009 on MTV.ca! Check out #1 all the way to #100, including hit videos from Beyonce, Eminem, Jay-Z, Lady Gaga, Yeah Yeah Yeahs, Kid Cudi, Green Day, and more.

With Kristin Cavellari came drama... as well as a ton of the hottest music featured on the Hills to date! Check out the latest videos featured in Kristin's wake, including hit music by Leona Lewis, Shakira, Green Day, Miike Snow, and more.

MTV.ca presents Scotch Mist, Radiohead's latest musical masterpiece. Watch special footage of Radiohead in-studio performing 'In Rainbows' live!