Listen to a clip of Demi Lovato's new track, "Heart By Heart."

+ Listen to a clip of Demi Lovato's new track, "Heart By Heart." The song is slated to appear on the forthcoming soundtrack, The Mortal Instruments: City Of Bones. The set, due Aug. 20, also features Jessie J, Zedd, and more. (Just Jared Jr.)

+ Watch Rihanna twerking to Drake's verse on A$AP Rocky's "F-----' Problems." In the quick clip, a friend directs her to "Uh uh uh. Drop it!," to which the twerk-master happily obliges. (RapFix)

+ It feels like an eternity since Robyn dropped her Body Talk series (actually, it was 2010), and it turns out we may have a long wait for her next record. "I'm nowhere near being finished with the album -- it's probably going to be awhile before you hear anything new from me," she told The Guardian. BOO! (Billboard)

+ You may think you've read every review of Kanye West's Yeezus, but if you haven't seen Lou Reed's take, which was published yesterday, check it out. He gives a unique perspective as a fellow artist. Spoiler: The Velvet Underground frontman loved the album, too. (Rolling Stone)

+ Against Me!'s Laura Jane Grace is embarking on a short solo tour. The band's had some band member departures in recent months, and a forthcoming album, Transgender Dysphoria Blues, is in progress. Laura's tour launches Aug. 10 in Philadelphia, PA, and wraps in New York on Aug. 16. (MTV News)

+ Snoop Dogg/Snoop Lion participated in a Reddit AMA (Ask Me Anything) on Monday night. Aside from discussing weed, he extolled the virtues of his "Ashtrays & Heartbreaks" cohort Miley Cyrus and his fondness for K-Pop. (MTV News)

+ Watch Big Sean's mother, Myra Anderson, appearing in a "Jimmy Kimmel Live" skit entitled "Words To Your Mother." In it, Big Sean's mom recites lyrics from his hit song "Dance A$$," and yes, it is as hilarious as it sounds. (Rap-Up)

Photo credit: Getty Images