PewDiePie -- Hey Bros ... I'M IN HOLLYWOOD!

Heads up Seth Brogan, Selena Bromez, Angelina Brolie and even you Lindsay Brohan -- the biggest bro of all bros has finally touched down in Hollywood, PewDiePie -- and he brought his super hot GF with him.

Bro ... the YouTube video game god is reportedly in town to shoot a TV show ... and based on his Twitter page , he's pretty pumped about it.

"Off to LA, got 2 crazy months ahead of me! Exciteddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"

Yeah.

It's been a HUGE month for the 25-year-old Swede -- real name Felix Kjellberg -- who hit 39 MILLION subscribers on his YouTube page ... and finally racked up 10 BILLION video views.

Plus, check out his girlfriend Marzia -- aka CutiePieMarzia -- with him at the airport.

Dude is winning.