Actress Uma Thurman has paid tribute to the winners of a short film competition after appearing in their projects as part of the prize.

Three budding film-makers - Henco J from South Africa, Ivan Petukhov from Russia, and Jessica Valentine from the U.S. - won the annual Jameson One Shot movie contest, pioneered by Kevin Spacey.

They were flown to Los Angeles to direct the Pulp Fiction star in their movies, and the films were then premiered at the YouTube Space in Los Angeles on Tuesday night (29Jul14) before being unveiled online.

Thurman took the opportunity to praise the trio's efforts, saying, "Writing a short is no mean feat, as the screenwriter has to convey all the subtle nuances of a character in just a few minutes, but Henco, Ivan and Jessica each successfully created a depth to their stories that made their characters seem utterly believable, despite their brevity.

"We had only two days to shoot each film, but everyone was at the top of their game and it really was a joy to work with each filmmaker. I hope Jameson First Shot gives our winners a great platform to start their careers, as I have no doubt these are three names we'll be hearing again in the future."

Spacey says, "Our aim with Jameson First Shot every year is to give up-and-coming filmmakers the chance to make an incredible short film, and I think our winners this year have really outdone themselves... I'm sure that this will be the start of something very special for each of them."