Actress Jennifer Lawrence was reportedly left starstruck by pop sensation Justin Bieber after being introduced to him at the Cannes International Film Festival last week.

`The Huger Games` actress reportedly fawned over the Canadian star when she was introduced to him at Vanity Fair's 100-guest dinner at the Hotel du Cap Eden Roc, reports contactmusic.com.

"(Jennifer) was dying to meet him. She told him she's a big fan - and that she finds him cute,` a source told Us Weekly magazine.

Robert Pattinson was also spotted hanging out with Bieber, who was on his best behaviour at the event and was "very nice" to all the guests.

Another source said: "He went up to Justin at the bar and said, 'What's up?' "

It's not the first time 23-year-old Lawrence has been left in awe of an A-lister.

Earlier this year, the stunning actress was lost for words when she came face-to-face with `Homeland` star Damian Lewis, who plays Nicholas Brody on the hit show.