Buzz Bites (4/8/13): Watch Demi Lovato's Two 'Heart Attack' Video Teaser Clips

Watch Demi Lovato's two "Heart Attack" video teasers, Kelly Clarkson, Taylor Swift, and more perform at ACM Awards, and Miguel and J. Cole perform "Power Trip" live in today's Buzz Bites.

Watch two teaser clips from Demi Lovato's "Heart Attack" video.

+ While we excitedly await Demi Lovato's "Heart Attack" video premiere tomorrow (the song releases today), she's given us a 9-second teaser to tide us over. "#HeartAttack video premiere. 4/9. Get ready," she tweeted. Demi also tweeted teaser No. 2 last night. (Just Jared Jr.)

+ The 2013 American Country Awards aired last night. Watch Kelly Clarkson perform "Don't Rush," Carrie Underwood sing "Two Black Cadillacs," and Tim McGraw perform "Highway Don't Care" with Taylor Swift and Keith Urban. (Neon Limelight)

+ Miguel invited surprise guest J. Cole to his performance at Brooklyn's Barclays Center. The pair performed J. Cole's "Power Trip" for the first time live. (Rap-Up)

+ See Phoenix's return to the "Saturday Night Live" stage, where they performed new songs "Entertainment" and a mashup of "Trying To Be Cool" and "Drakkar Noir." Their forthcoming album, Bankrupt!, streets April 23. (Billboard)

+ Listen to Big Sean's NSFW "Switch Up," featuring G.O.O.D. Music cohort Common. Despite it dropping shortly after Kid Cudi left G.O.O.D. Music, the song has nothing to do with that, Big Sean says. "We're still crew whether it's G.O.O.D. Music or not, that's my dog," he said of Cudi. (MTV News)

+ Happy birthday, Pharrell Williams! The producer celebrated in Miami over the weekend with a star-studded party that included Miley Cyrus, Lil Wayne, Jennifer Hudson, and Pusha T. Take a look at photos from the fiesta and get a load of that awesome cake. #wewant (Rap-Up)

+ Rihanna treated her mother to our kind of birthday gift: a shopping spree in Beverly Hills! Check out photos of RiRi goofing off with her mom while shopping and posing with fans. (Rap-Up)

Photo credit: Hollywood Records