Star Tracker: Demi Lovato, Victoria Justice, Paulina Rubio and more!

Demi Lovato was recently photographed with a sticker on her phone that read, “Heroin killed the radio star," and had to defend the statement on Twitter. "I've had the same sticker encouraging sobriety in a cool way for over a month now. No other reason than to inspire a younger generation to stay sober rather than falling into peer pressure and bad habits like so many have. #relax #soberissexy.”

Victoria Justice will take part in Nickelodeon’s Worldwide Day of Play in September, which will promote fitness and active play for kids. To date, over two million Nickelodeon fans have signed up.

Paulina Rubio appeared in a Miami courtroom to defend herself on recent charges after a police incident back in June. Charges include: refusal to obey a lawful command, obstruction of justice and disorderly conduct. If found guilty, the singer could face a year behind bars.

Alejandro Sanz has been confirmed as the fourth judge of La Voz Mexico. The other judges to round out the panel of Mexican version of the American singing competition are Lucero, Aleks Syntek, and Espinoza Paz.

—Radio personality Eddie "Piolín" Sotelo helped out with various charity programs and causes like Lowe’s Heroes, Carter's Kids, and Rebuilding Together to construct a jungle gym for Nueva Esperanza Charter Academy in San Fernando, CA.