'Problem' Singer Ariana Grande Dating Big Sean Following Breakup From Jai Brooks, Sings 'My Everything' For ‘Grandps’ At Stand Up To Cancer

Ariana Grande now has one less problem after successfully passing through the friendship zone with Big Sean and is currently heading towards a full-swing romance with the latter. The new couple is said to be so in love they just can't get enough of each other.

An insider recently revealed to Us Weekly that Grande and Big Sean - born Sean Michael Leonard Anderson - are already getting serious and that their romance has definitely speed up "it's gone from 0 to 60 fast" because they have developed "chemistry immediately."

The 21-year-old singer and television actress and the 26-year-old rapper have known each other since 2013 when they collaborated for "Right There."

Although they didn't really instantly clicked at that time, they quickly got romantic after Grande's split from Jai Brooks just last month.

Also, it appears that their romance blossomed at the perfect time when they both are not attached anymore.

It can be noted that Big Sean and "Glee" star Naya Rivera, who surprised her fans recently when she tied the knot with actor Ryan Dorsey, called it quits back in April.

"Sean asked Ariana out in a romantic way and they went to the movies," one insider gushed. "Now it's gotten serious very fast. They are much happier than in their previous relationships."

While Grande and Big Sean are being coy about their alleged romance, sources say that it's pretty clear that something's going on between the two.

At the MTV Video Music Awards on Aug. 24, the two were seen holding hands backstage and they were noticeably pretty sweet towards each other.

A few days later on her "Today" show appearance, the "Bang Bang" singer revealed that she's quite "happy" with her love life as of late.

Meanwhile, just this Friday, Grande joined the annual Stand Up To Cancer fundraiser event, performing her emotional song "My Everything," reported MTV.

On Twitter, the "Sam & Cat" alum wrote that she's performing the title track of her album for her grandfather.

"supporting a cause that is near & dear to my heart. tonight I'm singing for grandps! i miss u," she tweeted, according to E! News.

After her performance, she tweeted that she sobbed her eyes out and gushed about missing her late grandfather.

"sobbed my eyes out as soon as I got back. idk how he was just here & now he's not & I'm singing a song in his honor. sucks a lot #fuckcancer," the 21-year-old singer wrote.