Find out why Zac Efron, Chris Hemsworth and more of Hollywood's male stars are painting their nails

Some of Hollywood's leading men are nailing it with the latest Internet challenges. Click below to see the men putting their best beauty skill forward to benefit different charities. Zac Efron painted his nail red in partnership with YGAP to bring awareness to the fact that one in five children are victims of physical and/or sexual abuse by the age of 18. Photo: Instagram/@zacefron

Liam Hemsworth had his older brother Chris to thank for the nomination. The Hunger Games star made sure his solo nail matched his green surroundings. The Aussie actor didn't stop with his photo, nominating his brother Luke Hemsworth, Jimmy Fallon and Kelly Slater. Photo: Instagram/@liamhemsworth

Chris Hemsworth was the ultimate #polishedman while he showed off his red nail with the caption, "I'm a @YGAP #polishedman Being a @PolishedMan isn't just about remembering to buy flowers, how many rounds you shout, or how much you lift. It's about saying no to violence against children." The Thor star nominated his younger brother Chris, Zac Efron, Robert Downey Jr., Jeremy Renner, Mark Ruffalo and Tom Hiddleston. Photo: Instagram/@chrishemsworth

Pretty Little Liars Tyler Blackburn had a green thumb to bring awareness. Photo: Instagram/@tylerjblackburn

Rock star Dave Navarro #PutTheNailInIt with a purple nail to help end domestic violence and encourage victims to come forward and get the help they need. Photo: Instagram/@davenavarro

James Marsden did a shaky job at painting his nail for the #polishedman challenge after being nominated by Zac Efron. Photo: Instagram/@james_marsden

DeAndre Jordan showed off his freshly painted blue nail in support of the #polishedman challenge after being nominated by good friend Zac Efron. Photo: Instagram/@deandrejordan6

After being nominated by his brother Liam, Luke Hemsworth showed off his pink nail in support of the #polishedman challenge. Photo: Instagram/@hemsworthluke

Suits star Gabriel Macht was a polished man matching his nail with is suit while on the set of his show. Photo: Instagram/@Gabriel Macht

Pro surfing legend Kelly Slater joined the challenge after being nominated by Liam Hemsworth. Photo: Instagram/@kellyslater

Singer Vance Joy painted his nail red for the #polishedman challenge. Photo: Instagram/@vancejoy