Emma Roberts, Chord Overstreet Caught "Making Out"

Credit: Jordan Strauss/WireImage.com; Kevin Mazur/WireImage.com

Flirt alert!

Scream 4 star Emma Roberts, 20, and Chord Overstreet, 22, looked like quite the couple at the A|X Armani Exchange and 944 Magazine carnival in Indio, Calif. on Saturday.

"They were making out," a witness tells the new Us Weekly (on stands now). "They couldn't keep their hands off each other!"

(Roberts once dated bad boy Alex Pettyfer, 21; Overstreet has been linked to Taylor Swift, 21, and Glee costar Naya Rivera, 24, in the past.)

As the party neared its end, Roberts and Overstreet were just getting started. "They were talking about heading to a hotel pool!" a source says.

Things cooled down the next day at Coachella. "She was leaning into him," a witness tells Us, "but he seemed way more interested in his food."