Pro skater Chad Muska, a close friend of the Olsen twins and Nicole Richie, was arrested early this morning outside the Roosevelt Hotel in Hollywood for felony vandalism.

X17online was there to capture photos and video of his arrest at around 2am.muskagraffiti230.jpg

Eyewitnesses saw Muska spray painting his name on a number of buildings on Hollywood Blvd. ... including a Coffee Bean and the El Capitan Theater. The pro skateboarder had spray painted "Muska" and "Muska Kills" in green.

He's currently behind bars on $20,000 bail.

See a photo of a clean-shaven Muska and pal Nicole Richie hanging out in Hollywood back in 2006 ... after the jump.