ONE child star of huge US drama looks practically unrecognizable 21 years after his debut on the show.

Malcolm David Kelley, 32, is best known for his role of Walt Lloyd in Lost.Malcolm David Kelley as Walt on the set of Lost.Malcolm David Kelley at a COS event.

He was first cast in the hit ABC show back in 2004 and was a regular cast member on the first two series of the drama.

After the initial season, he only made sporadic appearances for the rest of the run because of a dramatic growth spurt.

Malcolm made a notable appearance in the series finale of the third season and had multiple stints throughout the fourth and fifth instalments.

His last spot came on the mini-episode, ‘The New Man in Charge,’ that was included on the DVD box set for season six.

Now, the actor is nearing middle-age and is all grown up in what could be described as a far cry from his childhood star days.

On Instagram he could be seen promoting his music endeavours on his social media.

He is regularly posing in sleek outfits, which often include expensive-looking sneakers.

Denim jeans and Adidas sweatpants are regular choices for his wardrobe.

Following his departure from Lost, Malcolm made several appearances on a variety of roles.

He was cast as Benjamin Cooley, a recurring character in the TNT crime drama series, Saving Grace.

Unfortunately, his next project was not as successful when he appeared in the comedy-drama series, Gigantic.

Malcolm played the lead role of Finn in the 2011 show, which was cancelled after just one season.

He also made several film appearances which include True to The Game in 2017 alongside Vivica A. Fox.

Producers also cast him as Michael Clark in Detroit alongside the likes of Will Poulter, John Boyega, John Krasinski and Anthony Mackie.

The star also worked with former Disney Channel stars, Dylan Sprouse and Cole Sprouse in Adventures in Appletown.

A man carrying a boy, while other people walk away in the background at night.