Maddie Ziegler and Cat Deeley are both obsessed with the Boomerang app from Instagram.

Just recently, the “So You Think You Can Dance: Next Generation” special judge posted a short video of herself fist-bumping with host Deeley. The 13-year-old “Chandelier” dancer dubbed Deeley her “boomerang buddy.”

This is not the first time that Ziegler shared a Boomerang video with Deeley. A few weeks ago, the former “Dance Moms” star revealed that she taught Deeley how to use the app. In their first Boomerang together, Ziegler and Deeley could be seen shaking their hips. Their second Boomerang video simply showed their hair flowing.

Meanwhile, Ziegler’s stint in “So You Think You Can Dance” is coming to a end very soon. After the finale, the young dancer is set to release her own clothing line. On her and Mackenzie’s official website, it was confirmed that the Maddie clothing line will be released in the fall. “I’ve always wanted to do a clothing line and I’m very excited about it, because this whole line is pretty much all of my favorite clothes that I’d wanna wear.” Ziegler added that she decided to release her own clothing line to bridge the gap between children’s clothes and adult clothes. “I’m excited to finally be in between so we can finally relate to what we can wear,” she said.

Ziegler will also be starring in Sia’s new music video for “The Greatest,” which will officially be unveiled on Tuesday, Sept. 6, according to News.co.au. “The Greatest” was directed by Sia’s longtime video collaborator Daniel Askill. The track serves Sia's and Ziegler’s fourth music video collaboration after “Chandelier,” “Elastic Heart,” “Big Girls Cry” and “Cheap Thrills.” Ziegler also performed “Alive” on “The Ellen Show,” but she was not featured in the song’s official music video.

Maddie Ziegler Maddie Ziegler will star in Sia's newest music video "The Greatest." She will also release her own clothing line next month. Pictured; Maddie Ziegler at the FOX Summer TCA Press Tour in Los Angeles, Calif. on Aug. 8, 2016. Photo: Getty Images/Matt Winkelmeyer