media_removed_toofab 2013

It's been four years since the first "Hangover" movie -- but boy has little Carlos grown in that short time.

Grant Holmquist and his twin sister Avery primarily played the chubby-cheeked son of Heather Graham's stripper character, Jade

And last night, Grant reunited with the cast on the red carpet for the Hollywood premiere of "The Hangover Part III," where he also reprises his role.

So cute ... and still wearing baby blue!


According to his mom, it sounds like Grant has a favorite costar. 

"When he sees him [Zach Galifianakis] in the trailer or in the paper, he'll go, 'Oh, there's Zachy!'" she tells People. "He's taken to calling him Zachy, Grant loves him."

Check out the gallery above to see photos of Grant and Zach messing around on the red carpet, plus shots of a very sexy Heather Graham, Bradley Cooper, Ed Helms, Ken Jeong and, randomly, Hanson.

"The Hangover Part III" opens Friday.