'Love Actually' actress Olivia Olson all grown up

(Getty)

The adorable singing schoolgirl from "Love Actually" is all grown up — and you would barely recognize her.

Olivia Olson, who played Sam’s love interest Joanna Anderson in the beloved 2003 rom-com, is now 23 and carving out a career as a singer and voice-over actress.

The LA-based entertainer voices "Adventure Time’s" Marceline the Vampire Queen and Vanessa Doofenshmirtz in the Disney cartoon "Phineas and Ferb." In 2013, she released her debut EP, "Beauty in Chaos."

Olson has her own YouTube channel with more than 19,000 followers and shares personal photos with her fans on social media.

'Seinfeld' cast send touching video messages to fan dying of cancer

Olson rose to fame aged 11 after delivering an unforgettable performance of Mariah Carey’s hit "All I Want for Christmas Is You," in Richard Curtis’s "Love Actually."

Curtis later revealed that Olson’s rendition of the song was so good, he was worried people wouldn’t believe it was actually her singing. The audio was edited in post-production to make it sound more “realistic”.

In the movie, Olson played the crush of schoolboy Sam (Thomas Brodie-Sangster) who learnt to play the drums to impress her. He later chased her through the airport on Christmas Eve to declare his love and was rewarded with a peck on the cheek.

This article originally appeared on News.com.

Four4Four: How many ribs did model remove?