Emma Roberts strikes the right 'Chord'

Emma Roberts and Chord Overstreet are back together and cozier than ever.

The two lovebirds -- who briefly broke up but have now reconciled -- hit up California's Coachella Music Festival together.

On Saturday, they hit up A|X Armani Exchange and T-Mobile's Neon Carnival, where they played around on the bumper cars and even went down the "giant" slide together, a party source told amNewYork.

"They were definitely hanging out together the entire night," the spy said.

Also at the carnival were Usher — who “only wanted to on one ride before hitting up the dance floor with his entourage” — Josh Hutcherson, Gerard Butler and Penn Badgley with gal pal Zoe Kravitz.