Ariana Grande is gearing up for Coachella and her fans can't wait ... including us! And as everyone anticipates the big day, Ari posted two 'NSync-inspired videos on Twitter leading fans to speculate she may be collab-ing with the 90's boy band in the desert! What?!

First off, would NSync ever even reunite? Would Justin Timberlake agree to do it? We knowwww Lance Bass would! Here's what's tipping people off -- Grande posted a throwback video her mom shot of a Sunrise, Fla. concert from 1999 and her mom's HOLDING Ariana in her arms at the concert! Then she posted a clip of her singing "Tearin' Up My Heart" in her dressing room. She captioned it: "The best medicine. 90s baby."

Ari's manager Scooter Braun has helped fuel speculation, Tweeting on Wednesday, "Coachella you have no idea what's coming!!!!" And he commented on Ariana's throwback video of the 1999 'NSync concert, writing: "Little Ari and Nsync #tbt."

Fingers crossed -- this would be INSANE!