8 apps that celebrities use to build their brands and express themselves

Face Swap allows Sia to live up to her faceless, public image all while promoting her albums.

In 2016, Sia took to social media to call on fans to download Face Swap and switch their faces with the model portraying her on the cover of her new album while using the hashtag #IAmThisIsActing. The magic of Face Swap led to social media promotion for her seventh studio album, "This Is Acting," which, according to Complex, sold 81,000 copies in the first week.

Perfect365 has helped craft some of the iconic Kardashian-Jenner selfies we all know and have seen on our Instagram Explore pages.

Kim Kardashian's preferred selfie-editing app, Perfect365, is an augmented-reality beauty platform. According to Seventeen, Kim and the Kardashian-Jenner clan use the app to touch up their photos and give themselves the perfect glow. Think glossier lips, deeper tan lines, and makeup and hairstyles straight from the runway.

After a yearslong back-and-forth between Taylor Swift and Apple Music, the app and singer have since reconciled and entered a lucrative dynamic.

After a brief chapter of bad blood between music megastar Taylor Swift and streaming service Apple Music, Swift is currently using the app to connect with fans in a whole new way. She is asking fans to create their own playlists that she can view with the hashtag #PlaylistbyME.

With more followers than just about every other public figure, pop star Ariana Grande truly dominates Twitter.

With the 11th most followed account on Twitter as of this publication, with more than 64 million followers, Ariana Grande is no newbie to the Twittersphere. Grande has capitalized on using Twitter as a marketing tool to promote albums such as "Thank U, Next" and "Dangerous Woman."

However, she is also famously known to take to the app to voice her opinions and share the ups and downs of her personal life, from the Manchester arena bombing to her relationship with Mac Miller.

"Friends" star Jennifer Aniston said she lets her creative juices flow with Bitmoji.

Jennifer Aniston said she loves a good personalized avatar and that she enjoys Bitmoji because it allows her to be an artist. And she said in an interview with E! News that she creates Bitmoji for her friends, too.

The app allows users to customize cartoons in their own image, or create entirely different personas in an adorable and easy-to-use way.

DJ Khaled's inspirational Snapchat speeches helped him rise to fame.

In an interview with BBC Radio 1Xtra, Khaled credits Snapchat with being a game changer in his career and allowing his fans to get to know him personally. He said he uses it to inspire other people but also to motivate himself.

He also said that he prefers the social media app over others because of its realness.

"When you push the button I ain't got time to act," he told Business Insider. "You push the button and I'm just being me. You can hear it in my voice. You can see it in my eyes. It's just being me."

Actor and legend Dwayne "The Rock" Johnson showcases his life for all to see on his YouTube channel.

Dwyane "The Rock" Johnson, one of the highest-paid actors in the world, is also a YouTube star. He has his own channel titled The Rock, which has well over 4 million subscribers and features videos of the actor attending premieres, answering fans' questions, or just cracking jokes. His first video in 2016 was a trailer to announce the launch of his channel that he said would "change the game" of YouTube.

Using TikTok helped Lil Nas X popularize his chart-topping hit "Old Town Road."

Breaking records by holding the No. 1 spot on the Billboard Hot 100 chart for 19 weeks in a row, "Old Town Road" has become a global cultural phenomenon. The 20-year-old behind the legendary track, Lil Nax X, actually got his start on social media app TikTok. Allowing users to create quickly dubbed over videos with different soundbites and audio, the app became the perfect place to spread the country-trap hit.

The song spread like wildfire on the app after listeners created memes involving the song, causing it to go viral.