The 17-year-old star is reportedly dating All Time Low vocalist Jack Barakat, 25. The couple was first spotted together at the premiere of Breslin's latest flick Ender's Game last week.
A source told E! News the couple "just started dating," and added that Barakat even visited Breslin on the set of her new movie Maggie.
Breslin began her acting career at the age of three in the 2002 sci-fi film Signs. She grew up on the silver screen appearing in over 25 films to date. She is best known for her performance in Little Miss Sunshine which received great reviews and earned her an Academy Award nomination.
Breslin's rep had no comment about the relationship.