Credit: Jason Merritt/Getty Images

Nobody surprises like Sandy!

Ryan Reynolds got a very special surprise on the red carpet at Monday night's premiere of his comedy The Change Up at the Regency Village Theatre in Westwood, Calif.

As the 34-year-old hunk wound up his time on the carpet (alongside costars Jason Bateman, Olivia Wilde and Leslie Mann), he noticed a last-minute arrival out of the corner of his eye: Sandra Bullock.

PHOTOS: See more pics of Sandra and Ryan's reunion from PopSugar

The 47-year-old Oscar winner looked radiant in a black strapless stretch-techno jumpsuit from Lanvin's winter 2010 collection. Seeing his pal and Proposal costar, Reynolds jumped from the press line, ran over to Bullock and gave her a big hug.

The duo -- who both dealt with painful divorces in 2010 -- famously rang in 2011 together during a raucous New Year's Eve at Bess Bistro, Bullock's Austin, Tex. restaurant.

After posing for photos with Bullock, Reynolds then re-joined his castmates, and Bullock went into the theater with a group of female pals.

The actress and single mom (to adorable baby boy Louis Bardo) is recently back from London, where she has been shooting Gravity with George Clooney.