The 16-year-old dancer called Sia "the best person in my life."
The two appeared to enjoy a double date at a theme park earlier this month.
Find out what happened when ET crashed #TeamWitlo's Thursday practice!
ET joined Milo and Witney at their 'Dancing With the Stars' rehearsal.
ET caught up with #TeamWitlo following their nearly flawless salsa with Riker Lynch during Monday's Trio Night.
Follow along as ET breaks down all the best moments in the ballroom Monday night!
"Can't believe this car is actually mine!!"
See the 'Riverdale' actress stun on the red carpet, along with Shawn Mendes, Sarah Hyland, Julianne Hough and more!
The singer stepped out for a Netflix event in L.A. rocking her own blonde locks.
The 'Dance Moms' star is celebrating a birthday, an anniversary and a new project with Sia and Kate Hudson.
ET spoke with the dancer during Instagram's Knott's Scary Farm celebrity night on Friday.
The actress ditched her long locks for a buzz cut back in July.
The theme of this week's challenge is dance, so Maddie's the perfect fit! 'Project Runway' airs Thursdays on Lifetime.
Carly Rae Jepsen and Sia muse Maddie Ziegler also lend their voices to the animated dance movie, arriving in theaters on Aug. 25
