hollywood Gavin Rossdale gwen stefani peace sign

Gavin Rossdale is putting his electric guitar down for a bit ... and focusing on his acting career. Nice slippers, Gav!

Gwen Stefani's hubby, who also happens to be the lead singer of Bush, was in a great mood while heading to the set of Sofia Coppola's upcoming flick The Bling Ring ... based on a true story about a group of teens who robbed the homes of Hollywood celebrities.

No word on what role the daddy of two is playing. However, just yesterday, Paris Hilton filmed a cameo for the movie ...and hung out with Gavin on set. Can't wait until this movie hits theaters next year!