By Joseph Martinez -

Friends and former co-stars Sandra Bullock and Ryan Reynolds reunited on the red carpet while Olivia Wilde looked red-hot for the LA premiere of "The Change-Up" held at the Regency Village Theatre in Westwood, Monday, August 1, 2011.

Bullock showed up in a chic black strapless Lanvin jumpsuit with strappy black sandals, gold hoop earrings and a stack of gold bracelets. She was all smiles, posing for pics with Reynolds, her co-star in the 2009 film, "The Proposal."

Olivia Wilde sported a fiery look wearing a red Antonio Berardi Pre-Fall 2011 dress matched with red satin Brian Atwood ‘Maniac’ pumps.

Other celebs in attendance included co-stars Jason Bateman and Leslie Mann among others. (photo by © 2011 Joe Martinez / PictureLux)

About the Film:

Growing up together, Mitch (Ryan Reynolds) and Dave (Jason Bateman) were inseparable best friends, but as the years have passed they've slowly drifted apart. While Dave is an overworked lawyer, husband and father of three, Mitch has remained a single, quasi-employed man-child who has never met a responsibility he liked. To Mitch, Dave has it all: beautiful wife Jamie (Leslie Mann), kids who adore him and a high-paying job at a prestigious law firm. To Dave, living Mitch's stress-free life without obligation or consequence would be a dream come true. Following a drunken night out together, Mitch and Dave's worlds are turned upside down when they wake up in each other's bodies and proceed to freak out. Despite the freedom from their normal routines and habits, the guys soon discover that each other's lives are nowhere near as rosy as they once seemed.

The film opens nationwide on Friday, August 5, 2011.

View more celebrity photos of Ryan Reynolds at PictureLux Imagesearch