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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

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Tags Buzz Bites, Miley Cyrus, Rihanna, Taylor Swift, Kelly Clarkson, Jennifer Hudson, Big Sean, Miguel, Demi Lovato, Tim McGraw, Keith Urban, Pusha T, Lil Wayne, J. Cole, Carrie Underwood, Phoenix, Pharrell Williams, Kid Cudi, Common

Beyoncé's presale tour tickets for 14 cities begins today.

+ Presale tickets for Beyoncé's "The Mrs. Carter Show World Tour" will be available to BEYHIVE blog members beginning at 10 a.m. local venue time today for 14 North American cities, including New York, Chicago, and Los Angeles (some European presale tickets have already gone on sale). #COUNTDOWN! (Beyonce.com)

+ Demi Lovato is U.K. Cosmo On Campus' Spring issue cover girl. She raps about being ready to date, "The X Factor," and has relationship advice for Lovatics: "It is very unhealthy when girls devote all of their time to a guy and forget their friends and family. I did that. I was always looking for distractions because I was so afraid of being alone." (MTV News)

+ Speaking of Demi Lovato, she will be on the Feb. 22 episode of "The Price Is Right." Demi will be competing for the charity Free The Children, whose program's work to eradicate child exploitation. (Just Jared Jr.)

+ Austin Mahone will be chatting with fans on @MTV's Twitter tomorrow at 7 p.m. ET. Pose questions using the #AustinMahoneMTV hashtag. Also, stay up for the MTV.com video premiere of Austin's "Say You're Just A Friend" featuring Flo Rida, which hits at 12:01 a.m. ET on Thursday. (MTV News)

+ Fun. and Tegan And Sara are hitting the road together! The "Most Nights" North American tour launches July 6 in Toronto, and wraps on Sept. 26 in Charlottesville, Va. (Idolator)

+ Pink opens up about her family and what makes her feel beautiful in the March issue of Redbook. "Beautiful has never been my goal," she says. "Joy is my goal -- to feel healthy and strong and powerful and useful and engaged and intelligent and in love. It's about joy. And there's such joy now." Now that is beautiful. (Just Jared)

+ Listen to Taylor Swift duet with Tim McGraw and Keith Urban on "Highway Don't Care," from Tim's Two Lanes Of Freedom album. Taylor's also announced that "22" will be her next single from Red. (Just Jared)

Photo credit: Columbia Records

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Tags Buzz Bites, Tegan & Sara, Taylor Swift, Beyonce, Austin Mahone, Demi Lovato, fun., P!nk, Tim McGraw, Flo Rida, Keith Urban