Willow Smith lends her voice for the 'Adventure Time' series finale theme song
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Singer-actress Willow Smith is making a dream come true by appearing as a guest star on the series finale of Cartoon Network’s beloved animated series “Adventure Time, which airs Sept. 3. Smith will voice the character of Beth, ET reports, and will also feature on the finale episode soundtrack by performing the series main title theme.

Now 17, Smith turned 10 a few months after “Adventure Time” premiered back in 2010. The young artist also released her debut single “Whip My Hair” that same year. She’s a huge fan of the network’s longest-running series and even named a track called “Marceline” from her debut album, Ardipithecus, after “Adventure Time” character Marceline the Vampire Queen (who coincidentally loves rock music).

The “Adventure Time” role is not the first time Smith has voiced an animated character. She voiced the character of Baby Gloria in the 2008 Dreamworks Animation film “Madagascar: Escape 2 Africa” and voiced Abby the next year in a TV short holiday installment from the beloved franchise called “Merry Madagascar.” Smith began her film career in 2007 with a role in her dad Will Smith's sci-fi horror film "I Am Legend." The multi-talented artist notably made Time's 30 Most Influential Teens List last year, keeping company with her brother Jaden, pop superstar Shawn Mendes, Khalid, Noah Cyrus and more.

The series soundtrack will be available for pre-order on Saturday, Sept. 1 ahead of its release on Sept. 4. The album will feature over 20 songs and includes original music from composer Tim Kiefer, a new song from former “Adventure Time” storyboard artist and writer, and “Steven Universe” creator Rebecca Sugar (watch her perform it at Comic-Con above) and a full-length version of Ashley Eriksson’s “Island Song (Come Along with Me).”

A special vinyl edition of the soundtrack is available for pre-order and will be released this fall via Mondo.

“Adventure Time” enjoyed a 10-season run on Cartoon Network, chronicling the adventures of a boy named Finn (voiced by Jeremy Shada) and his faithful dog and adoptive brother Jake (voiced by John DiMaggio). The critically-acclaimed series has drawn in over 3 million viewers for some episodes and has received multiple prestigious awards including eight Primetime Emmy Awards and a Peabody Award.

The Sept. 3 “Adventure Time” series finale will be an extended episode starting at 6 p.m. ET/3 p.m. PT on Cartoon Network. An “Adventure Time: The Final Seasons” DVD will be released in conjunction with the series soundtrack on Sept. 4.