The Hairspray Live! star took to Instagram on Monday to promote the new video with a special behind-the-scenes snap -- and reveal her love for the 24-year-old rapper.
"#MyFavoritePartVideo ? That time I dropped my groceries, had a bowl of Cheerios, fell in love w my neighbor through the wall telepathically and it rained in my apartment. I love you @larryfisherman," she wrote. "We made another cool duet and i like your singing voice. ♡."
Grande and Miller also spent the day goofing off on Snapchat, which the "Dangerous Woman" said helped cheer her up after wrapping up her one-night-only performance as Penny Pingleton in NBC's live musical.
"Taking me out of my post Hairspray depression minute by minute," she captioned a silly video of Miller on Snapchat. "I love you."
Grande might be all about showing off her beau now, but that wasn't the case during an interview with Ryan Seacrest in September, when the singer went off on the radio host for asking about her relationship with Miller.
"If I post something, that's what I'm willing to share at that moment," she snapped at Seacrest. "That doesn't mean then you, Ryan Seacrest, with millions of listeners are entitled to more information."