YES, an insider tells E! News, these two are definitely dating.
"They have been friends since they made [Problem] together," the source says. "They have been spending more time together and recently have been getting very close."
Grande and Sean, of course, were both involved in recent high-profile break-ups.
Earlier this month, Ariana ended things with Jai Brooks because he wasn't supportive enough of her; Big Sean, meanwhile, split from Glee star Naya Rivera (who has since gotten married!) a few months ago admits rumors of infidelity.
But the two have apparently found comfort in one another and were recently spotted at The Grove in Los Angeles after leaving the theater from a late showing of The Purge.
Like Tim McGraw and Faith Hill, this is a country couple almost too good to be true. Miranda Lambert and Blake Shelton are also subject to the same kind of tabloid scrutiny, but show no signs of cracking.
Yes, they met on The Bachelor and yes, Sean Lowe and Catherine Giudici are epically cheesy ... but they own it, and are as true to one another and to their values as any celebrity pair we've ever seen.