Ariana Grande and Big Sean: Getting Very Serious Very Fast!

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Music stars Ariana Grande and Big Sean might have "one less problem without" their exes, but they can't get enough of each other and their new relationship.

The couple's romance is in overdrive, according to insiders, and it's because they were friends first. In other words, this is not your typical rebound.

Big Sean, Ariana Grande

An insider says the 21-year-old songbird and 26-year-old rapper went "from 0 to 60 fast" and that once they were single, there was "chemistry immediately."

Long before any Ariana Grande and Big Sean dating speculation, they collaborated on the hit "Right There" in 2013, then again this year on "Problem."

They only recently got romantic after Grande split from longtime love Jai Brooks and Big Sean called off his engagement to Glee's Naya Rivera in April.

Want to take a guess who made the first move, and how? Follow the jump ...

"Sean asked Ariana out in a romantic way and they went to the movies," the confidant explains, adding that ever since, "it's gotten serious very fast."

"They are so much happier than in their previous relationships."

Ariana and Sean have kept coy about their budding romance, but were recently spotted holding hands backstage at the MTV Video Music Awards.

Days later, the "Bang Bang" singer said she's "very happy" when asked about her love life, but wouldn't elaborate on with whom. But we all know, girl.

When and if they go "public" together remains to be seen, but it doesn't look like fleeting summer love; this is a celebrity couple worth keeping an eye on.

Check out lots more fun facts about Ariana below ...

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