Christina Aguilera & Fiance Matthew Rutler Cuddle Up at Rolling Stones 'Zip Code' Tour Kick Off!

Christina Aguilera flashes a big smile with her handsome fiance Matthew Rutler while posing backstage at Petco Park on Sunday evening (May 24) in San Diego, Calif.

The 34-year-old singer and her love were there to watch The Rolling Stones perform their greatest hits at the opening night of their brand new Zip Code Tour, which will see them travel to 15 cities in North America.

PHOTOS: Check out the latest pics of Christina Aguilera

In case you missed it, check out Christina sounding absolutely incredible on her just released rendition of “Anywhere But Here” taken from Finding Neverland: The Album!