Demi Lovato performed at Wednesday at Vevo's Certified Superfanfest event, which celebrates music videos that reached more than 100 million views online.
The "Heart Attack" singer admitted to being an Iggy Azalea superfan, which was fortunate since Azalea also performed.
"I love doing things that get me excited as a fan girl because sometimes it's easy to like get caught up in the industry," said Lovato. "But then you get these moments where you get to work with people that you're a huge fan of."
Azalea's got 99 problems and driving is one.
Before taking the stage, the 24-year-old "Problem" rapper said she's had a few close calls while learning the rules of the road.
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"I just learned to drive and it's been really difficult because I get followed by people in my car and I can't drive that fast yet so I'm not good at getting away! And I'm like 'this is really dangerous!'" Azalea said before the concert in the Barker Hangar at Santa Monica Airport.
The Australian performer has had a huge year with chart-toppers like "Fancy" and her Ariana Grande collaboration "Problem."
Azalea's "Black Widow" featuring Rita Ora sits at No. 2 on Billboard's R&B/Hip-Hop songs chart.
She also recently collaborated with Jennifer Lopez on her popular re-boot of the summer single "Booty."
When it comes to navigating life in the public eye, Azalea said she easily shrugs off critics and cyberbullies.
"I try not to look at it," she said. "Although those things are unfortunate I can switch it off. ... I think the strangest thing is when for me it translates into my real life or being followed by people."
Pete Wentz of Fall Out Boy hosted the event which airs on Vevo's online, TV and mobile apps on Oct. 16.
Based on reporting by the Associated Press.