Johnny Depp flashes butt! No, sorry ladies, but actor does flaunt boxers and blonde hair on new 'Mortdecai' movie set, still dating beauty Amber Heard [PHOTOS]

Popular actor Johnny Depp is 50-years-old - but he's still a hottie!

Depp stars in the upcoming action-comedy crime movie "Mortdecai." Here's a short wiki description:

Juggling some angry Russians, the British Mi5, his impossibly leggy wife and an international terrorist, debonair art dealer and part-time rogue Charlie Mortdecai (Depp) must traverse the globe armed only with his good looks and special charm in a race to recover a stolen painting rumored to contain the code to a lost bank account filled with Nazi gold.

On the set of his new film in London, Depp had to drop his pants. But sorry ladies, he wasn't going commando. The scene's pretty funny though, with Depp casually walking around in red knee-high socks, garters, and a classy pair of beige boxer underwear. Unflattering, but still so adorable.

Depp also had to dye his signature dark hair blonde for the upcoming flick. Check out some behind-the-scenes photos here (and here).

The "Pirates of the Caribbean" heartthrob also flaunts an old-fashioned mustache.

What do fans think of Depp's new look?

"Mortdecai" also stars Ewan McGregor, Gwyneth Paltrow, Paul Bettany, and Olivia Munn.

The actor is currently dating 27-year-old actress, Amber Heard. They met on the 2011 movie set of "The Rum Diary."