Christina Aguilera & Matthew Rutler: Boxing Match in Vegas!

Christina Aguilera stays close with beau Matt Rutler as they leave a boxing match on Saturday (September 17) in Las Vegas.

The 30-year-old entertainer (wearing a Dolce&Gabbana dress) and her beau watched as Floyd Mayweather knocked out Victor Ortiz.

PHOTOS: Check out the latest pics of Christina Aguilera

On the way back to their limo, Christina was nice enough to take a photo with a fan.

Earlier in the week, Christina was spotted out and about with her cutie pie son, Max, in Santa Monica.

Christina and Max also took a trip to Kauai, Hawaii late last month!